Sounds like she jealous of the niece but hey some people never grow up
Honestly the way you describe her it could be any reason no grown as* woman in her right mind would act that way towards young adults who are our future... Treating people with respect has no age minimum or limit... That lady needs a reality check and I'm sure she's going to get it soon...
Hope her daughters don't listen to her either
I think the niece will be better off without the aunt in the life at all she sounds like she will never give her any real love or like even just my opinion
do they treat her like crap too or are they ok
when the aunt is not around
then ditch them too they don't care for the niece so she can do with out them
Perhaps she is not very self aware.
We used to call those women "church bitties" because they are attracted to churches. They are a toxic organism, like Ebola. Very hard to eliminate. Best thing to do is to stay away.
I've seen it many times in my life. If you can find it, read "Evil Genes" by Barbara Oakley. It might help you to understand her better.
Maybe or maybe not. Maybe at the moment, but not later.