If I were to Sort her, I'd be torn between Slytherin and Ravenclaw, and would ultimately have to let her choose for herself. She would think less of me, the venerable Sorting Hat, for my moment of indecision. Later in the school year, she would sneak into the Headmaster's office and cover my brim with purple sequins. Then she would blog about it. So it's best she's too old to go to Hogwarts in the first place.