Her current moves are (yup, mine is a female):
Replace Rock Slide. Rock Slide only hits multiple targets in double battles and you already said why Stone Edge is better. But, if you want you could replace Stone Edge with Rock Slide only when you do double battles. And I suggest that Crunch becomes Zen Headbutt to deal with Fighting types (Zen Headbutt gets powered up by Tough Claws too).
I hope I helped!