Said that, the OP seems to do her job very well and she is asked more than what is required. It’s absurd.
People have their lives apart from work. I know work is a big part and very important but people have other responsibilities too. As long as a person is efficient, there’s no reason to ask her for more.

I know she can look for other job but sometimes it’s not so easy. Maybe, there in the States it is but here in Spain I assure you all that it’s not so easy.