My MIL swears up a storm. Only at me and other caregivers. She's nice as pie to everyone else. It's verbal abuse and I struggle with being called "a %#" all day long. It's the foul mouth that bothers me the most and it hurts when it's directed squarely at me. Other people (except caregivers) comment on how "sweet" she is. Sometimes I tell her "that's enough - you are not allowed to take God's name in vain in my house." She'll answer back with lots of swear words but not in God's name. So she know what she's doing. The sting from her words really never goes away. :( She has been on hospice for 2 years.......but she bellows out curses all day. Such a strong voice and she tries to kick and punch too. We have tried all kinds of meds.... no meds......different med combos. The verbal abuse continues unless she is drugged to the point of constantly sleeping.... :(
I think personally, I would turn and walk out of the room if she started swearing. Hard to know what associations she can make at this point in the game.
If there are no other relatives, and she's been on hospice for 2 years (presumably in your home), I think it's time she goes to hospice in a hospice facility.
There's no excuse for singling you out for verbal abuse. It seems pretty clear that she's directing her hostility toward you personally. So get out of the situation. She's not your mother, you've done it long enough, so start thinking about finding somewhere else for her to live. You've done more than your fair share.