Maldopar. Is that the only drug she takes?
the only rap I could find from my Aussie friends, was one lady who said she did not care for its rapid on's and off's.
Any of the PD Drugs can give one vivid dreams, or they may be a result of her advancing PD.
Why do you say the Maldopar is ineffectual? Perhaps it is time to investigate other PD drugs??
Doese your Mum see a Movement Disorder Specialist??
It sounds to me like she needs a good workup and a drug protocol investigation.

CHarlie