Did I read correctly in your second post that her dad died when she was 18? So, a year ago? Has she received any counseling at school? Does she talk about it?
My DH's dad died when he was 18 and a freshman in college and it affected his college grades terribly. No one told him it was OK to take time off, grieve, etc. No one talked it much at all with him. He recovered and went on to do well later in school, but please don't underestimate the effect this all may be having on her.