Stand your ground, sweetie. If SC is too hot, hmmm - I'd offer Massachusetts, but then you'd miss the rest of your family I bet.

Be strong sweetie, even if you don't feel strong, pretend. Treat it like theatre. "Act" like her tantrums are those of a toddler, give her a timeout, then go on.

You deserve better. Some day she may realize that.

Has she ever had any sort of parenting classes or counseling?