Get her the book For Yourself by Lonnie Barbach. When I was younger I hated sex, had never cum with a partner, and it hurt like hell, but I knew I must be missing out on something since everyone else seemed to love it so much. Someone recommended her book to me when I was 21. She wrote the book in the 70s, but it's not like the female body has changed since then, so it was great for me.
The book lays out a regimen for getting to know your body and how to touch yourself. My sex life has been lots of fun and very pleasurable ever since
And I can pretty much attribute it entirely to doing what the book laid out. I spent about 2 months doing her exercises almost daily, which consisted of exploring every inch of my body in detail (a lot of women are insecure and this really helps you become more comfortable with intimacy), and progressing to touching, then fantasizing, and eventually focusing on learning to get yourself off. I think she requires you put aside an hour of alone time (not with a partner) so that you don't have anyone but yourself to take care of.
In fact, I'm planning on going back to those exercises again this summer, I'm a little out of practice at getting myself off without a vibrator and it's been a little harder with sex than it used to be. I noticed that getting in tune with my body like that really made me horny as fuck too! Should be a lot of fun