Trixie was thinking of expanding her “touring magician” empire.
Of course, the only way to do that is with multiple Trixies. So she’s recruited a kind Changeling to be her official imitation and is currently teaching her how to pull off the classic “underwater escape cell” trick.
Unfortunately for the Changeling, Trixie has already gone up for air twice so far, and still hasn’t told her when to use the key to escape. She’s nothing if not patient.