Let me be the first to say don't let her start watching Inuyasha. The series has promise at the start...until it hits the filler after episode 30 or whatever it was and it doesn't end. I, regrettably, own all DVDs and movies of it that have been released and have now sworn to not buy any more of it.
Excel Saga is good...until the last last episode, then it's just full of WTF and massive brain explosions. It's hard thinking of animes that have action that have a female lead. All the ones I own (and trust me it's a good amount) that have action in them have mostly male leads. Can't go wrong with GTO though from what I've heard, I still haven't watched it yet.