Wow, I'd really like to applaud you for being a great ally.
Does her high school have a gay/straight alliance or other organization for GLBTA students? If not, she's most likely going to have to wait until the fall and college. Lots of campuses have resource centers for GLBT students and organizations that form around those resource centers. The Dean of Students' office will usually have leads as to what resources are available for a GLBT student on campus. Usually within the first couple of weeks of school an active organization will let students know of its existence. Looking for "Safe Zone" stickers is also a good idea if she's looking for other allies:
This is just one example of the sticker; it has many incarnations.