My father had Parkinson's. Two different eras of it actually. When I was a teenager still and then through medicines and other he had a short "remission" but when after it came back hard and I spent six years of my life being way too good of a caretaker. My mom was healthy at this time and he had an aide and yet I made the in retrospect of "well can't go back so no regrets but..." to drop my life and help. When he passed he was headed to hospice but never made it. I never really got to say goodbye. I feel you here in many many ways... I do suggest letting go with the trip when you realistically can without burden might bring her closer and have it be not without her but with her... everywhere.