My siblings feel if we move Mom it may be too traumatic for her and she may die. What am I to do?

Mom (92) has dementia, very cantankerous, has a drinking problem, lives in a bad neighborhood, doesn't want to move. She doesn't want to bathe unless shes going somewhere. Thinks I am taking her money, just is very difficult to deal with. I am her legal guardian and conservator. My nephew lives in the home with her and cleans and makes sure she takes her meds. She is very forgetful and repeats herself constantly. She thinks she can live alone. I do all of her bills, shopping, get her home repairs with her money and keeps track of it. I have 3 other siblings that basically does nothing to help. They may go to visit 1 per month. I go every 2 to 3 days. I was robbed at gunpoint in front of her home about 7 years ago and am terrified about going to take groceries, etc to her. Her home is paid for and she doesn't want to go into assisted living. She really only has around $1700 per month for housing, not enough. My siblings say just leave her alone and let her live her life out there but they are not the ones going by to see her often.