Audrey (Sue Nicholls) experiences the shock health scare during another furious row with her family over the hairdressing salon, collapsing with pain to the horror of her loved ones.
As Audrey recovers in hospital, David (Jack P Shepherd) deeply regrets letting the salon war go too far - believing that stress has caused his gran's condition.
Kylie is later livid when David claims that she's to blame for Audrey's heart attack as she kept pushing him to fight for the salon. As Kylie then questions her future at the Platt house, is it the end for her marriage?
Digital Spy recently caught up with Paula Lane, who plays Kylie, to hear all about the storyline.
Why does Kylie have such strong feelings about the salon war?
"Well, at first Kylie thought that Lewis was quite charming, but that changed as soon as Audrey demanded the salon back to finance a round-the-world cruise. Kylie just thought, 'Hang on a minute - this is mine and my son's livelihood that's at stake'.
"She feels that it's unfair for Audrey to take it away from David now - she has a real bee in her bonnet over this and she wants to see it through."
Audrey has been quite good to Kylie in the past. Doesn't Kylie feel any guilt?
"I don't think she does! But I think what's quite sad is that everyone keeps getting their wires crossed. There's been a few times where Audrey in particular has considered making amends, but then something else happens to cause more trouble.
"Kylie is dead set in her ways - she's like a dog with a bone over this and she won't drop it. She does really care about David and she doesn't want him to be treated unfairly. As far as Kylie's concerned, David has worked hard for that salon and put a lot of graft into it. She's just sticking up for him, really."
"Kylie's quite shocked, and she really didn't think that it would get to this point. It's interesting, because Kylie's never really had a grandmother figure, so she hasn't experienced an older generation before. That means she's never had to think about what happens when a family member gets old.
"You'll see in the episodes that Kylie says, 'Well, she's an old woman and old women have heart attacks'. At first she doesn't understand that the stress of the situation could have caused this, but when it does eventually start to hit home, Kylie is quite unnerved by it. It comes back to haunt her, because David blames her for the whole thing."
Does Gail blame Kylie too?
"Gail was initially siding against Audrey, but the heart attack changes everything and she turns on both Kylie and David. I think that's so she doesn't have to blame herself. Blood's thicker than water, and so suddenly all of the fingers start pointing towards Kylie..."
How does Kylie feel about David blaming her?
"It really shocks her. She's really let down by him, because she feels that it was his idea in the first place to try keeping the salon. Kylie's seen it through, but David's fallen at the last hurdle and now all of the fighting is being blamed on her.
"Kylie is really upset that her husband is not standing by her. It's often the case that David's family see her in a bad light, so she needs all the help she can get. Kylie thinks David should be on her side."
"She does, and that's because she feels like she's on her own again. Becky's gone, so she doesn't have that sisterly figure on the street anymore. So instead she gets completely hammered on booze, makes a complete fool of herself at the Bistro and just causes havoc again.
"It's literally like she's lashing out - she's so mad with David."
Was it nice to switch back from sensible to wild Kylie?
"Yeah, it's always nice to explore the character's old ways, and I've always said that - a leopard doesn't change its spots. Kylie is always a bit temperamental, so she can quickly flip back into those sort of states. Those scenes are quite challenging - Kylie is quite a handful to play! She keeps me on my toes, put it that way."
What happens next?
"Kylie decides to leave the Platt house after all the rows. But when it comes to Max, she really does want to be a good motherly figure now. She knows that it's going to be incredibly hard to do it on her own, but she gives it a go and takes Max with her.
"She's had the time to learn, although she hasn't got a lot of confidence in herself. But she definitely tries! She may fail, but we'll have to wait and see what happens."
What kind of a response do you get from playing Kylie these days?
"From the response that I've had from the public, they do seem to have an affection for Kylie. I think that could be because she disappoints and makes the wrong choices, but the viewers can still see her trying. I think they do feel for her and care for her, but then she goes and blows it again!"
"It's going really well. It's been incredibly difficult fitting it into my Coronation Street schedule, I've got to say. I crashed and burned a bit recently and had to have a couple of rest days. But I've really enjoyed the challenge.
"I'm not sure if I'll ever do it again, not in a job like this anyway! I might just stick to the odd 10k run. But it's kept me alert and I'm definitely fitter than I've ever been in my life, so that's got to be a bonus!"
What do you think of the recent news of Sue Johnston joining Coronation Street as Stella's mum?
"I'm absolutely amazed. It's brilliant that Corrie's getting these big names to come in and make an impact. It really raises the profile of the Street and I think it's amazing that people are wanting to come in and share their talents. Sue Johnston is brilliant and I think she'll make a really good contribution to the show."
Michelle Keegan recently told us that she'd like Kylie and Tina to be friends. Do you think that would work?
"Well, I think Kylie would be really worried that Tina and David would elope together! (Laughs) But I absolutely love Michelle, so whenever we do get any screen time together, it's brilliant.
"We'll have to see - I think Kylie's missing a friend. She's tried to get that in Eva and that worked for a little period. We'll have to see, as the writers can come up with anything and that's the beauty of the show. They can change the whole dynamic in a page."
"I'm thrilled for her. I always knew that she was going to go onto massive things, so it's no surprise to me that she's landed these big jobs now.
"I went to see Kate in She Stoops To Conquer, and she was brilliant in that. She's going back to the screen now and I can't wait to see it for myself. They're two very different roles and completely the opposite to Becky, which I'm sure will stretch her and she'll go on to do even more amazing things."
Where would you like Kylie to go next?
"I love the emotionally-charged storylines, but you can never predict what the writers are going to come up with. Maybe she could get a new job or become Carla's little sidekick in Underworld! Kylie can turn her hand to anything, and that's a great quality in the character - she can always adapt herself!"
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Coronation Street airs Mondays, Thursdays and Fridays on ITV1. Paula's London Marathon fundraising page can be found here.