What did her contract stipulate as her duties as executive assistant?
That’s the $12 million question?
I have never had a maid or a housekeeper, but the laundry stuff seems like it would be part of the job.
Backscratching and shirt buttoning seems more personal, like something a butler or “manservant” would do.
Personal abuse, though, is out of the question. If you don’t like what someone is doing, and you can’t civilly correct them, then fire them.