Shocked when she finds Belle in a compromising position with her new boyfriend Luke, Lisa orders the schoolgirl to attend an appointment with the doctor to discuss contraception - secretly hoping this will scare her off from letting the relationship develop too soon.
Here, Jane Cox - who plays Lisa - reveals full details of the latest family drama for the Dingles.
What makes Lisa realise that Belle is growing up?
"It's that she's starting to be a bit sneaky about things! Also, Lisa has caught her wearing make-up, for example. Lisa catches her out going to school with a load of make-up on, and she's a bit upset about that. Belle also keeps answering back and being very cheeky!"
How challenging is this experience for Lisa?
"Well, it seems to have happened overnight. One day Belle was really lovely, and the next, she seems to have turned into this person who doesn't seem to like Lisa very much! Lisa finds that very difficult, because she doesn't have any experience of this at all, and Belle was always so good and understanding before."
Does Lisa fear that Belle is growing up too soon?
"She does think so, because it's happening very quickly. Lisa also thinks that she's being influenced by other kids at school - particularly Gemma, this new friend of hers."
How does Lisa feel about Belle having a new boyfriend?
"Well, Belle's had a boyfriend before when she was with Sean, and that was very sweet and innocent. But now with this other boy Luke, it seems to be a little bit more full-on."
How do things go when Lisa invites Luke for tea to meet him properly?
"Belle gets embarrassed, but Lisa thinks he's actually quite a nice young man. He's very polite and he seems very helpful, so that's really nice as far as Lisa's concerned. Luke is hoping that he'll get to spend some time alone with Belle in her bedroom, but Lisa has no idea about that."
Does Lisa have any inkling or fear that Belle may take things too far with Luke at that point?
"I think Lisa wouldn't really think that, because Belle is her daughter and she's very young. Lisa just wouldn't think that was going to happen."
But then the storyline develops further the next day. What happens?
"Debbie comes to tell Lisa that Belle has bunked off school. Debbie explains that Belle has gone into the house with a boy, so Lisa thinks that is very weird. She bursts down there and she finds Belle and Luke on the sofa together in quite a clinch! So Lisa gets him out of there quickly, and just thinks it's ridiculous. She's furious about it."
Is that why Lisa takes Belle to the doctors?
"Yes, she just wants to put Belle off, really! She decides that she's going to have to tell Belle what's what when it comes to contraception and things like that. She wants to get it all sorted out in advance, which is a very sensible thing for Lisa to do. It's because Lisa fears things could go too far without Belle fully understanding.
"When they visit the doctors, it doesn't go terribly well for Lisa because Belle doesn't want her to be in the room with her. At first Belle doesn't mind, but once the doctor starts talking about pills and things like that, Belle wants her mum out - understandably! But Lisa's just feeling at sixes and sevens over the situation. It feels like her little girl is rejecting her."
Belle eventually confides in Lisa and Zak back at the Dingle house…
"Yes, Belle explains that nothing has happened with Luke, and thank goodness for that. She's very young."
Will we see more tension between Lisa, Belle, Dom and Gemma?
"Yes, I think you're going to see a huge amount more! Certainly between Belle and Lisa - there's a lot more growing up to do. Belle is only 14 and she might come out of it by the time she's 18, if Lisa's lucky!
"I'm not sure whether Lisa is that happy about Belle seeing Gemma again, but what can you do to prevent it? Gemma is introducing Belle to all these different boys, so she's not a very good influence. Lisa would like to keep them apart, but they're at school together - what can you do? Lisa isn't keen on Dom, either - she thinks he's full of himself, and he certainly appears to be!"
In real life, what's it like to watch Eden Taylor-Draper - who plays Belle - growing up?
"It's been almost imperceptible. It doesn't seem two minutes ago since she was 6, had just started in Emmerdale and was singing 'Walking In The Air' and all of that! Now she's a young woman, a beautiful one and very lovely. I feel very proud of her."
Are you and Eden enjoying the story and what's to come?
"Yes, we're enjoying it very much already. I think Eden's enjoying having a right snap at Lisa! We both enjoy having those right good rows with each other! Luckily that's not us in real life - we're fine. But it's nice to be able to play that."
What advice would you give to Lisa?
"I would say don't take it personally. Also, remember you are the parent and she is still the child. I think the tendency can be to take things very personally, get very upset with whatever the kids are doing, and feel that it's your fault.
"It's just a phase that Belle is going through and she needs Lisa to still be a parent. I think you need to give your child boundaries and allow them to grow up!"
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Emmerdale airs weeknights at 7pm on ITV, with an extra episode at 8pm on Thursdays.
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