Shenton suggested that Mitzeee's time in prison, due to being framed for the attempted murder of Mercedes, has hardened her.
She told the Daily Star: "When she first arrived a year ago, she was this ditzy glamour model with big hair. Now you've seen a different side to her.
"I think this has changed her forever.
"I'd like to see her go back to a version of herself but I don't think you can ever go right back when something like this has happened."
Mitzeee, who arrived in the Cheshire village in July 2010, rushed to hospital to be beside dying lover Riley Costello.
Hollyoaks continues this evening at 6.30pm as the Mitzeee storyline heats up.