My opinion is that people like her must be very angry at the world. I don't think it is just you, as she has been this way with all the other caregivers too. If you can, don't take it personally. There have many stories about spouses or children being treatly badly by their family members. We expect them to be greatful, but many are not. They don't want to be in the position they are in so they take it out on us. Fortunately, my husband who is very sick is not like that. He is always thanking me. Maybe you need to just tell her like it is. Does she have family? If she keeps losing people willing to care for her, she may just end up in a nursing home. I would tell her that if she doesn't want me there, so be it. You can quit and she can torment someone else. Caregiving is not an easy job-even with family members. Hang in there and do what is best for you.