Ugh, Mia - she sounds utterly vile.   "Mistreating a disabled person"?????  I would stay well away and don't worry because karma will get her in due course.  It can't not.  

Sounds a lot like my family's small towns background in some ways.

My mom's parents and extended families all are centered around a very small rural town where the Southern Baptist church that my GGGPs donated the land for and hand built the first Sanctuary for is the epicenter of family power and dynamics.  Though the rest of the community couldn't care less at this stage in progressing history.    I have a couple of fade-ingly distant cousins who still think that they and "we" are something special there.  We are not.  Though I will say even in my 60s if I visit my baby bro at the family church cemetery and stay overnight in town a number of people know who I am, who my GPs, GGPs, et al... are, etc... Even now.  One quadrant of the cemetery is both sides of my mom's mom's family, another side/corner is  my mom's dad's family.  Our family section is right in the middle.  Both of my GPs and my baby brother are currently there with owned plots surrounding them for my parents, my family, my brother and his family.  Though I, and maybe my bride, will likely be the last of the Mohicans who go there.  Even then it will likely not be all of our cremains as some of those will go to various adventurously accessed locations and in my DW's family spots.  Our main joint memorial will go in my family's dirt.  That church cemetery has a tradion of notable above ground memorial stones.  Another memorial or two will be placed with part of our ashes in my bride's family's dirt.  In two locations. One in her biodad's family  dirt, (he was killed in a car accident while my MIL was pregnant with my DW) and one in her parent's dirt.  At least that seems to be the current plan.  Though my FIL (DW's StepDad who raised her her whole life) is split.  Half of him is in the mountains overlooking the valley where MIL, FIL and DD first lived for a couple of years after they married when DW was 2mos old.  Half of MIL will join him there.  I was the one who remembered to pin the GPS coordinates for the spot where FIL was spread into the wind.  The rest of FIL and MIL, when it is her time, will go into the family plot in the small town where DW and her three younger Sibs were born and MIL and FIL made their lives together.

My dad's side of the family is multigenerational pretty much all in the same small lead mining town in the Ozark mountains.  Not nearly the generational jockeying for position that occurs in mom's clan, but interesting in that only my GPs left.  The did retire there after nearly 30yrs over seas.  They are in the town cemetery.  Dad road trips to put a flower on their stone and on the stone of his aunt and uncle (GM's sister) and to visit his cousin. The closest thing to a sib that dad has.  The interesting thing about that town is that it is very economically depressed but has always had people pulling into pick up their food stamps driving new Cadillacs.   It used to drive my granddad nuts.  He would rant for days about it when he would grab me to go on a greasy spoon cafe adventure when I was visiting them.  They kept a PO box at the local PO which was also the food stamp office. So when we would check the mail while out searching for the best never cleaned pot of chili or toaster cooked chicken fried steak and it was food stamp day, it would set him off to no end. 

But as usual, I digress.