Just where to turn now???

My father passed in August of 2020 and two days later my alcoholic mother who is 77 got up in the middle of the night and fell and broke both bones in her leg in half. Long story short, a surgery and rehab stay that was supposed to be two weeks turned into six months. Mom was in pretty good health up to this point. But half way through the six months mom lost her mind didn't know who we were and did not remember my father had passed. It was horrible. She did make very good progress and we made the descion to move her in with us. We talked to Dr about pain pills as she has been taking them for the better part of 20 years and told him there can not be anymore as with the drinking if she comes home I will not stand for it. I am 50 and have never seen my mother sober until now. A week after she gets home she got pain pills and now she has completely fallen back into not doing anything at all. She will not do anything for herself. Why would a Dr do this to us and her? My uncle has medical POA and I have all other POA. We had a meeting with the Dr and he agreed after the fall he would not and that is was not a good idea. She had in home rehab that she lied her way through and I had to let them know every day she was not doing what she said she was. My mother showboats. When it is just us here she does nothing but get out of bed and literally take 6 steps to her chair. If family is here she gets up, comes upstairs and seems like all is well and makes me look like a fool. We have taken her in. She lives in a finished 1800 sq foot living space all to herself. She has everything she needs to cook and fend for herself, like her own little apt. Yet she calls me sometimes 50 times a day on the phone so I can do everything. My dad had COPD and did everything for my mother and did not make her do one thing. One day I explained to her that with my wife and my kids and the fact that I have spinal cancer I can not make it like when my dad was here for her. I kid you not she looked straight at me and said "It's not my fault you don't love me as much as your father did" it's more like he didn't have a choice. He had COPD and I know even though in the last stages he would have lasted months and months longer if she did not wear him down to the bone. She is doing it to me. How do you go about setting boundires with parents and sticking to them as not to make it seem like you hate them? She moved into our house, the house we own we bought and she insists that it is more her house than ours; she actually wanted our bedroom and the upstairs and wanted us to be in the basement. It's getting out of control. Help