Next Monday (July 23), Sunita and Karl are caught out by Stella when they rekindle their affair in the Rovers Return, leading to chaos for the Price and Alahan families.
"Something's happened to Sunita. It's Weatherfield water," she said on This Morning. "It was quite shocking though as I read the script. How would I move and be that girl? Maybe she's read [50 Shades of Grey]."
Delving into Sunita's mindset, Gulati explained: "She's had kids and she's with a man who doesn't really care. Then she finds a man who really wants her.
"She does feel rejected by Karl. [Dev]'s just smothered her again. So it's all very complicated for her, and she just feels like, 'I need something. I need to go out'."
However, the actress concluded: "She takes an option - the maddest and biggest option of Sunita's live. I thought, 'Wow!' She was very drunk at the time."
Gulati added that Sunita's decision to stay with Karl is an example of "momentary madness" which sums up her personal "crisis".