Hmm. Well I was under the impression that you wanted a variety of mixed and pure blood students.

Perhaps, because she sucks at magic, she wasn't really accepted by the other Pure-blood students, I was playing with the idea that she had joined DA to learn defensive magic or something. The front page does not really say how or why the group of player characters is leaving. Is the story starting when they run away? Sometime after? Did they all leave together or just find each-other during the story? I'm sure I could come up with something if I knew more about the specifics, something odd and circumstantial, rebelling against parents, looking for something for herself... There are defiantly possibilities.