you should definitely tell her
even if you're gonna be as forward as maleficent said.. you gotta tell her. you never know what you'll miss. from the things that you've said, you both seem pretty comfortable. if you admitting your feelings doesn't go as well as you hoped, I'm sure you both will continue to have a great friendship.
at the same time though, from the sound of things.. I think she'll totally go for it!