I don’t think Parkinsons affects one side of the body much more than the other, at least not usually. That’s stroke territory, there.
I would think that a stroke would affect her speech and motor coordination continuously and grossly. Not just "lay down for a few minutes and everything's fine". For instance, a stroke victim would not be giving a press conference this afternoon, at least not without a readily observable affect.
That's why I wondered if PD had some of the symptoms of a stroke. My (limited) understanding is that symptoms come and go depending on the severity, and also they can be covered up temporarily.