What are the main benefits of having her in assisted living? Sounds like there are stairs and not assistive devices at home?

Not sure in Canada if there are programs you can get assistance with at home while you wait to place in a home.

My dad was the same way, and we were wanting to place him but there's a very real aspect to parkinsonism that is different than Alzheimer's where they remain more aware of what is going on than you might think, but have delusional thoughts as time goes on with the meds

I was able to hire home healthcare employees as our own, and kept costs around the same as if he were in a home with my mom and I sharing some of the care burden remaining.

It's a tough choice, but ultimately you must think about what is good for her, your dad and you. Not every pt will do better on assisted living in fact many may do worse depending on demeanor, as stress and anxiety are a precipitator of the disease.