To me, it seems that she just has a serious chip on her shoulder. If I say anything, she will twist it around to be the worst it can be. That's one reason I hardly talk to her anymore. About anything. I haven't told her that I appreciate anything she does in a while. She doesn't accept it well, even when it's given with good intentions. (See above.)
She is physically at home several days during the week, because she works 12 hours shifts, and usually works one, if not two, on the weekend. It's just the fact! It doesn't mean she works less, just that she is more likely to be here when a repair person could come. But, she had to turn it into something else.