She sounds like
all mothers to me, just a bit more extreme than most!
My mum drives me nuts but you have to accept your family, you don't have to like them all of the time but you have to love them and respect them. (Obviously I'm talking about everyday families like mine and yours, not Fred West or anything

)!
You have your own family to worry about and take care of, you shouldn't be babysitting your mother and if she says one thing but means another then what can you do? You're not a bloody mind reader! She needs to accept that she has made the swap and make the most of it. Two faced people often find their words come back and bite them on the backside and thats her issue not yours. I think when you have your own kids it really makes you look at your parents in a different light and you can see all their faults so don't be too hard on her but at the same time don't take any crap!!!! And as for your aunt I'd tell her to butt out. Some people get off on a bit of drama. If she really thought your mum was going to kill herself why wasn't she either straight round your mums or straight round yours or at least on the telephone?
Good luck