Audrey makes a surprising choice in next week's episodes as she decides to rekindle her romance with Lewis, believing that he is a changed man following his previous cons.
Well aware that her daughter Gail (Helen Worth) won't be happy, Audrey decides to hide her news from her loved ones for the time being.
Nicholls told Inside Soap: "If Audrey was my friend, I'd be saying, 'Darling, think about it!' You read this sort of thing in the papers all the time - women of a certain age being charmed by these men. I'd ask her to think about what she's doing."
"I don't know if Audrey should trust Lewis," she continued. "She's rebelling against the disapproval. Gail is very blunt, and it's not like she has a good track record with men!"
Nicholls added that viewers also seem to be suspicious over Lewis's intentions.
"I get people shouting, 'Audrey, watch out!' It'll be interesting to see if they're right as the story progresses," she said. "Viewers will like it if it all goes well, but they'll also like the drama if it all goes wrong."
Nigel Havers reprised the role of Lewis earlier this year.
> Coronation Street Nigel Havers unsure of Lewis plot future
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Watch a preview of tonight's (March 9) Coronation Street double bill in the video below: