Blake,
She is so fortunate to have someone with direction, and who cares so deeply for her.
The thing is you can relate, you have been there. BUT
YOu know you cannot cure her....just be yourself. She must figure out on her own, and maybe that will be God's lesson to remind her how she can take charge of her own life. Sorry.....I know it is hurtful and natural to want to help. Keep on taking care of you, and being supportive. She will find a way out, and who knows? Those feelings you have discovered may just be hidden in her heart too.
Thinking of you.