Although I know that Alice appears in Freddy vs Jason vs Ash: Nightmare Warriors, I don't take that as canon in the series.  So I was wondering what other people may think about why Alice doesn't show up in other movies or is even mentioned.

I had a thought that Freddy got beaten by her twice. I like to think he just decided that he'd be better off avoiding her.  Sort of my thinking, "Well, she's 2-0 against me and she has the whole dream master thing going on... maybe I'd be better off attacking dumb children instead... Maybe Jason will help me out..."