Estate issues concerning my elderly mother-in-law.

My situation is unique and complicated, and I’m having difficulty finding any meaningful input as to how to address it.
In 2021, my brother-in-law and father-in-law both passed away within 6 months of each other. My mother-in-law’s health took a turn for the worst shortly thereafter. She lived in Louisiana, and we live in Georgia. After the doctors in LA told us we needed to put her in hospice, my wife convinced her to move to Atlanta and see if the medical care there would be anymore beneficial. After much convincing, she agreed, although she did not want to be in an assisted living facility. She used the proceeds from her husband’s insurance to buy a house in Atlanta, and my wife and I sold our house so that we could move in and care for her. At the time these decisions were made, my mother-in-law was near death. Our goal was to get her to Atlanta and get her proper medical care.
We had to use the money we made from the sale of our home to modify and make the new home handicap accessible. The new house is deeded to my mother-in-law, but it was placed in a trust so that it would go to us after she passed. My wife was saddled with the responsibility of dealing with my mother-in-law’s finances and healthcare, all while holding down a full time job and caring for my son. I helped her in every way I could, but the process nearly broke her.
My mother-in-law moved into the new house in April of 2022, and immediately she started getting better. By the end of the year, she was healthier than at anytime I had ever known her.
This is when the problems really started.
As she got better, she became more demanding and critical of my wife. It was a side that I had never seen, and I probably would not have agreed to live with her had I known. While it was annoying and aggravating at times, we learned to deal with it. She was healthy and alive, which was the important thing.
We began noticing changes in her personality towards the end of 2023, and tensions were rising in the house. In January of 2024, she declared she was moving back to Louisiana and she was selling the house we were living in. She accused my wife and I of stealing her money and abusing her, all completely false allegations. Within 2 weeks, she had contacted a moving company and moved out of the house, back to the house she still owns in Louisiana.
When she left, my wife was her POA and in full control of her finances. My mother-in-law never paid a bill in her life, only spent the money that my father-in-law made. When my mother-in-law moved out, my wife patiently tried to explain the bill paying structure that had been established, but she didn’t want to hear it. She was convinced we were stealing money from her account, not paying her bills. She revoked the power of attorney, and told us she was writing us out of her will.
Although she has been historically narcissistic, her erratic behavior has us thinking dementia may now be in play. She regularly sends us nasty texts and leaves rage filled voicemails. We don’t engage with her, only replying with a simple “I love you.” She has most recently said that we are both “going to hell”, that we are unfit parents who should have our 10 year old removed from the home, and that I am a bum that should be in jail. She has also physically injured a relative after she mentioned my wife’s name, gripping her arm so tightly it left a bruise. She has said she is leaving nothing in the will for my son, and is once again threatening to sell the house out from under us. Had we known any of this was remotely possible, we would have made different decisions regarding her care. The house is too expensive to buy from her, and any down payment we would have is already in the house. We’re trying to figure out where to go for advice for our odd situation, and if there is anything we can do to protect ourselves. Any suggestions would be greatly appreciated.
Apologies for the long tale.