Sometimes, regardless of how long or how close we are to our friends, they choose different paths for themselves. It's great to see how much you care for your friend, but she doesn't have the same mindset as you do. Try not to make her choices your responsibility..just let her choose what she needs to so she can grow into the person she wants to become.
My advice, let her choose her path and be there for her despite what path she chooses. In the meantime, do your own thing and build relationships with people who are like-minded.
Since you mentioned that you miss her and want to continue being friends, what you can do is withhold giving any more advice. Just listen and love her for who she is. This will bring the two of you closer.