sounds to me like there's not much you can do but letting her work through things her way. let her see this other doctor and maybe he'll say she should see a neurologist. i first saw an orthopedic surgeon, thinking i had something wrong with a rotater cuff and he told me to go see a neuro. i did and pd diagnosis took 10min, not a lot of discussion occurred. he gave me a starter kit for requip but i waited 5 years before taking meds.

there's no proven treatment for significantly delaying the progression of the disease that she could take now but the sooner she determines she has or doesn't have pd the better, so she could possibly take advantage of a clinical trial.