She has become angry and bitter. She has also been in depression for the last few years. Most recently her pain has become excruciating and she believes she is very ill. Mom’s orthopedic specialist, recommended an anti depressant along with physical therapy, for her diagnosis for arthritis. But, she does not like the way anti depressants make her feel. She has tried several for a few weeks, and then stops taking them. She believes she has made so many mistakes in her life (2 divorces). Now, selling her home and moving closer to myself, daughter, is probably another.
One thing I DO know from my own experience with my mom is that happiness is something your mom has to do for herself. You can't make her happy. You can make suggestions to her, but it's up to her to follow-through and take the steps necessary to make a good life for herself. So take that worry off your shoulders. It's not your job - it's your mom's. You sound like a very loving daughter who is working with a mom who is kind of difficult to help. {{{Hugs}}}
She would have her own place but be among people her own age, and many of them have transportation to and from dr. appts on certain days of the week. They could probably take her to PT appointments also.
You can't force her to socialize, but being in a place like that at least she wouldn't be at home by herself and isolated, which I think would be worse for her depression. She may find that she does enjoy the people and activities too.