How about a pair of angel wings?
was the first thing I thought of as I read your post.
For ME angelwings represent hope, love, spirit, soul. It can represent that she is a gift from above. You could incorperate it with a heart also to mean love, maybe even have the artist make her name part of the tattoo, instead of just writing it at the bottom.
First thought - two wings eitherside of a heart with her name on it, small, really small and stylish.