No. I have not changed yet, although I am no child now. [She ocks her head slightly.] Draco-- [Confusion spread across her face and then cleared. This must be what he was, then.] Ah. You are like the TARDIS. This form, it is much larger than the other one and you are both. [Her nose scrunched a little.]

The TARDIS cannot change itself to fit you properly, then?