it sounds like she may have a symptom we call "freezing " an inability to start walking or frequent disruption of walking in which her feet are stuck in one place. it is a pd symptom and a very difficult problem to treat. rarely it is associated with a high dosage of a dopamine agonist (like requip or mirapex) and can improve somewhat with a reduction in these medications. it also may respond a bit by visual cues - and she can practice stepping over a line in the floor - or by "marching. " president harry truman was thought to have pd in his later years and would march to a cadence for his daily walks - but had trouble with walking at other times. i would also suggest that she have some physical therapy by a therapist with experience in pd.
my mother has parkinson's disease. she complains her feet are sinking into the floor when walking. is this a symptom?