I think that your intentions were good, so don't feel bad. You were trying to protect your friend as well as yourself. That being said, it may be hard for her to trust you for awhile. Try to be a good friend to her, as it seems that she is closed off from the world. If your parents and hers have a good relationship, perhaps they can be mediators to gain her a little more freedom (after Facebook-Gate has blown over, of course). If her parents trust yours, perhaps your mom can convince them to let her have a little more freedom, as long as she is available to supervise or call on when needed.