((Daily Healing))
Don't be so hard on yourself--
You know logically that this is something with in the student as you have mentioned and you are the target... Even though logically you may know that, emotionally being a target hurts even if one knows the issues with the other person, it can hurt really bad..
I am sorry this is not much help-- but be kinder to your self is one thing. and keep talking to the director as well. If the director and this girl are close, perhaps the director can help the girl out a little more if they know more about her