Anyone else dealing with an ailing elderly parent who is difficult?

My mother has terminal cancer.  She wants to continue to live in her home and take care of her finances and medications, but she is on such high doses of pain medications now that she is confused at least half the time.  She gets verbally abusive when we try to convince her to do things differently than she wants...things for her own safety, etc.  The only way to escape it is to do things her way.  She is putting herself in danger of taking the wrong medication at the wrong time, which may have already happened once, and making a mistake writing checks for bills.  She doesn't live near any relatives even though two of my siblings have offered to have her move near them so they can help her.  She has home health aides right now, but wants to cancel or reduce the time they are there. She has hospice help as well, but refuses most of their advice and complains about them constantly. My older siblings have been handling things up to now but have recently asked me to get more involved because they are frustrated.  I talked to a hospice nurse yesterday and she said this kind of thing happens many times, so I thought I'd reach out and see if anyone else has gone through or is going through this type of situation.