The soap star, who plays Louise Summers, said that she would reconsider her future with the show in October.
"I'm not going to be there forever," McKee told Look magazine. "I don't mind the long hours but I'll have been doing that for four years in October when my contract ends."
When asked whether she would consider moving to Hollywood, she commented: "I don't see why not. I think you should aim for the stars - and hopefully avoid ending up in the clouds!"
McKee also revealed that she still regularly worries about her physique, despite winning the sexiest female gong at this year’s British Soap Awards.
She added: "I criticise myself an awful lot. I do worry to the point that I don't think it's very healthy. I'm always picking my flaws.
"It's a terrible anxiety I have. I wish I could pretend nothing fazes me but it does."