Hello LJW1
Urinary tract infections (UTIs) are well known to cause significant problems with hallucinations and delusions. My husband had PD dementia and suffered from frequent UTIs which, I'm afraid, accelerated his deterioration. I couldn't say whether they affected his movement.
I can't offer any advice other than to say always be on the lookout for signs of a UTI and if suspected get antibiotics quickly. Also try and get your mother to drink plenty as dehydration will not only make her more susceptible to infection but will also make hallucinations worse.
Does she have a PD nurse? If so she may be able to help. Also try the helpline on this site (phone number at top left hand side of the page). They will offer advice and support.
I know what you are going through and send my good wishes to you and your Mum.
Worrals x