I am not an MD and I don't what her problem is other than it is neurological (seizures, bad double vision that went away, weeks out of view of cameras, etc) But I do know about PD, beginning to end, and a second time beginning to late stage. I have also seen other PD patients at the assisted living, some as late as a week before passing. She does not have late stage PD, that is certain. She may have very early PD, but if she does, and it's her only condition, then she will live for 10-20 more years with treatment.
If she keeps falling at her current rate, she isn’t going to live another 10 to 20 years no matter what the cause of the falls are..