Hmm, that's odd, is it already on your armor, are you sure you have 30 farplane winds. Sorry for asking silly questions, but I'm not sure what could be wrong.
I would just go ahead and try to fight her again without worrying about it. When she reaches her 4th form leave a couple of people zombied if at all possible. Then they won't be killed by her megadeath. And use dispel to remove any regen.