What do I do when Mom refuses all help?

I need advice. My mom is 88 and living alone in a condo with steep stairs to her bedroom (upstairs) and basement. She sold her car and has no transportation. She is relying on my brothers and I to do everything for her. I live in another state, an hour and fifteen minutes away. My brothers are fifteen minutes away and refuse to do much for her. I received a call Tuesday that her freezer light was out. I told her I couldn't drop my plans and drive up to fix it, call one of her sons. One refused and the other couldn't come for two days. In the meantime, she discovered the freezer was over packed and it shut down to keep from over heating as the vents were blocked by boxes. At 11:30 PM her smoke detector battery is beeping; she calls me, will I drive up and fix it so she doesn't have to listen to it all night? The next day she got on a chair and pulled the battery out; it's at the top of those steep stairs; she's had a stroke and is unsteady. She constantly needs transportation to doctors, shopping (compulsive shopper), wants to go out and eat every day. She refuses to hire a housekeeper, even when given references. I quit cleaning her condo eight months ago and she has done nothing to clean it. Junk is piling in all areas and there is just a path everywhere to get through. The basement is floor to ceiling junk and you can't walk from one end to the other. She keeps buying more to add to it. I took her to her attorney, and he sided with her that she never has to leave her place. She will not under any circumstances consider assisted living or a nursing home. I was told to back off. My husband and I are arguing over my spending entire days there to help her and the cost of gas and mileage to us. I know she is lonely and depressed. Her neighbors don't want anything to do with her; she stares out her window and keeps tabs on them and they are feeling stalked. She refuses to use the senior van or call a taxi; considers it 'beneath her'. One son will take her to eat once a week, but she pays him for gas and pays for the meal. He hits her up for money constantly. The other son will take her to get groceries every two weeks, but originally had signed on for only once every four weeks. The other son went back on his promise to take her for groceries on the alternate two weeks. She refuses to buy/wear a bracelet to call help if she falls. A handy man lives right next door and she refuses to hire him to fix anything. She has a developmentally disabled daughter that she has given guardianship to me. She wants this daughter brought home once a month for a visit. The last time, my sister was agitated and screaming; the neighbors called the police. I was upset or days. I have two kids at home that need me here, as well as my husband having had open heart surgery recently. Her attorney declared her physically and mentally competent to live alone. Do I just leave her there to live in filth and get more depressed? My husband offered to buy her a condo to live very close to us; she could go with me to the grocery store, out to movies, etc. She said she didn't want to leave her area she's in. I had her stay with me for six weeks after surgery, and she made us so miserable that my husband, kids and I were in fear of her. My husband and I would hold each other and cry because she was intolerable, being outright cruel to us because this happened to her and she didn't want to be here. I promised never to move her in with us again. She treated the hospital employees so badly I was told not to bring her back there. I had visiting nurses here for her, and I ran into one of the women afterward, and she told me my Mom had nothing nice to say about me and my family and that I should never have her stay with us again. I love my Mom and want to do what's best for her, but apparently we differ in opinion. I am executrix of her estate. One brother threatens me with lawsuits continually and demands to be sole inheritor; the other brother wants nothing but to be left alone. What in the world do I do?