Quin came from possibly the most famous pure-blood family there is. She was a Moonheart, the Moonheart family were direct descendants from the great wizard Merlin. Both Quin's mother and father were in Ravenclaw, and expected her to as well. The thing they didn't know, is that she strives to be in Griffyndor. She wanted to be, in her opinion, in the best house of the four. Not to forget that the famous Harry Potter was coming to Hogwarts that year also.
Note that I am not a very good writer.
I do not own Harry Potter, it belongs to J. K. Rowling.