I agree with taking her to a store to let her try out some different ones.
Guitar center is probably one of the best for this and each one I have been in has a huge inventory of everything you could ever want.
I agree the Taylor will be probably the best fit but each person is different and likes a different sound and each guitar has a different sound also depending on how its made and materials its made out of.
and I would also bet she would have a lot of fun trying different ones out in the store.