Oh, not much. My sister has been possessed in part by her alter, and another man has been completely possessed by her alter's fiance. He coerced her into a slapdash Vegas marriage on the condition that he wouldn't harm my brother, who harbors another alter from their world. Our family is a bit complex.
I'm hoping she'll simply go home and rest, try to recover, but I don't know. I don't know what else we can do right now, however, if she isn't willing to ask for help.