It does a bit, doesn't it? She used to be able to take on any form. But then at some point decided she was fed up with changing.

[He wonders over, fiddles with a ring of too many keys (why does he have this ring? He misses just having the one key!) before locating one with the Seal of Rassilon and using it to unlock the door. And he swings it open.

Massive white room, not that different from his living room. Just with a console in the center instead of furniture.]

Inside the tiny little box.]

You're welcome to have a look around. [He's guessing Dally might want to check the outside first.]