The actress explained that she is keen to see Abi push the boundaries more, but conceded that she is unlikely to go as far as her older sister Lauren (Jacqueline Jossa).
Asked whether Abi could ever go off the rails like boozy Lauren, Fitzgerald told the official EastEnders website: "I'd like her to! I'd like her to dye her hair or something crazy.
"But I couldn't imagine her drinking. She's a bit too normal and she's very underage - she is 16. Just whipping out the vodka might be a bit awkward!
"I don't really see her doing it, but I think it would be cool. She has grown up a lot from what she used to be when I first started. But yeah, I'd like her to be a little bit naughtier - not always good."
Watch Lorna's full interview in the video below:
Fitzgerald also said that she wants Lola Pearce (Danielle Harold) to cause more problems for Abi's relationship with Jay Mitchell.
Discussing Abi and Jay's future, she commented: "I'd like them to run away and get married so I can wear a pretty dress. That'd be nice.
"I think they do stay together, but it would be nice again if Lola came into it, like how it was in the beginning - 'who will he choose?' Hopefully me!
"But I think they're going to stay together for the long-term. I've got a lot of scenes with him coming up in February time, Valentine's Day."
EastEnders continues tomorrow (January 31) at 7.30pm on BBC One.
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