She needs way better pain management, OP. Pain is the great enemy, not death. When pain is not managed, death is seen as preferable. My MIL has advanced Parkinson's, and has terrible bouts of painful muscular contractions - some that broke her vertebrae. When she's in pain, her meds are so strong they make her hallucinate, which my husband is not comfortable with (she's otherwise entirely lucid), but in my opinion hallucinating is preferable to muscular contractions so severe as to break bones!!! My MIL has often regretted getting a pacemaker a decade ago - she says she would have been better off dying of cardiac insufficiency...
... aging is not fun, OP. Please do whatever you can to alleviate her pain. Not vaccinating is an ethical concern for the other residents, however. I would get her vaccinated.