Oooh, that's true. I'd hate to lose the rusting part. Perhaps the curse causes her to turn to slowly turn to Tin instead then, perhaps after she spurns the Witch (male) of the East? And like how the Tin Woodman has himself nickel plated, perhaps she has herself platinum plated in the end.

Well, if you want to play on "Lions, tigers, and bears." You could name one Ursa (bear) and the other Tigris (or Pantha? for Tiger)