I work in a middle school with a lot of mainstreamed deaf students and very few teachers or kids bother to learn ASL. And, as you noted, not having anyone to talk to is very isolating. So, I think it's fantastic that you're so willing to learn ASL!
I think all the previous suggestions are excellent. Start by writing, learn to fingerspell, but best is for her to teach you sign. Learning from a native signer is best.
