How can I change the way hospital doctors and departments treat my mother?

My mother was admitted with HF in August. She has a myriad of health problems. It is horrible the way the doctors fire questions and information at her at times when she can’t understand it. They have talked to her while sedated, after a procedure, and woken her up. She feels that the staff isn’t treating her case right, but she handles it by being a “good girl.” It’s all over her chart, “patient denies weakness, tiredness, shortness of breath, hallucinations, etc.” And none of the departments talk to each other. She was told by one doctor, she would be released that day. An hour later, someone else told her they were taking her for a procedure. There is nobody to get answers from and no one person knows her history or issues. When they can’t discover why she is having a problem. They run tests without finding anything and send her home with the problem she arrived with. 7x in 4 months. To get anyone to listen to me, I have to have her declared incompetent. She will not willingly allow her daughters to control her life. She acts like we are teenagers defying her. I’m 60. Nobody explained anything in a way she can understand. She went in with hallucinations. They couldn’t identify a cause and decided internal G.I. Bleeding was a bigger concern. This is the third time they can’t find the cause of the bleeding. Her discharge papers were signed yesterday at 9:30 am. Her discharge states: unidentified GI bleeding. Patient released pending stable hemoglobin. She left the hospital 26 hours after those papers were signed, yet no further bloodwork was ordered. No cause was suggested for her hallucinations. She has stage 3b kidney disease and when admitted was at stage 4. She was never seen by a kidney specialist. When we asked the nurses why, we were told her GI bleeding is the most important issue right now. This happens over and over and over. She can’t fight for herself. She feels the doctors don’t want to deal with her. It’s a horrible situation for an elderly person. My mom has family to try and navigate and we can’t. What happens to an elderly person alone? Everyone I’ve spoken to with aging relative has similar stories. Has anyone found a solution?