Mom isn't eating and has been ill. She just wants to die.

One thought that comes to mind is to call Hospice. They offer a lot of information and resources and not only for end of life, but for the whole potentially long journey through old age.

My mom also was on a roller coaster. There were times when I was sure she would not make it, but she recovered ... with a lot of oversight. Sadly, years later, when she seemed to be doing well, one day she didn't wake up and passed away comfortably in her sleep.

Based on that experience, and reading your summary... I'm suggesting that you contact Hospice, because they can be sure you get the resources she needs for good care. She may have many, many ups and downs.

In my mom's case, I just wanted her to be comfortable and to find happiness in her years. I hope you are able to find the help you and she need for the roller coaster and am hopeful her next up period is just around the corner for you both. All best wishes to you.