You are awesome for doing this!! Just awesome.

My advice to helping this girl... say to her what you wish was said to you at that age... add your experience and wisdom to her world.

Be honest. Be yourself. Be a friend that listens. Commiserating (but not dwelling) is huge. Your presence is a light that will illuminate the possibilities of the world.

Just being in her life will keep her from feeling so alone. Don't put too much pressure on yourself to "save" her. You are a wonder and a miracle to her already.

...also, let her be a friend to you. If her friendship means something to you, let her know it.