I don't think it was anything you did. She sounds like she is ashamed of herself and doesn't want you to see her so down when things are going so good for you. She may feel bad that you have made it and she hasn't yet. Can you write her a nice note to let her know that you care for her unconditionally? It might work to break the ice so she will know that it doesn't matter what is going on you still want to be friends. At least you tried if she doesn't respond that is her loss. I wish you the best.