Yeah, I think most of Fantasyland you can, Pirates and Jungle Cruise and Whinnie the Pooh as well. I think I was told on one ride that lap sitting was not okay, I can't remember which one it was though, maybe Roger Rabbits Cartoon Spin Out? Not sure... but most of the resort it's not a problem.
My understanding is the lap sitting is okay on any ride that does not a lap bar. Meaning most of Fantasyland rides she will need to be sitting on the seat on her own. In fact there are very few rides that she will be allowed to lap sit. I can think of Small World, Pirates, Dumbo, and Pooh Bear