I was lucky with dad's GP who phoned me to ask me if I would attend an appointment with dad (with dad's permission) after dad got lost and arrivef att one of his appointments very late!
Other GPs at the same practice were completely useless when it came to dementia. It might be worth approaching a different doctor for advice but until your mum agrees to co-operate there's not much they can do.
In the meantime keep posting here. You'll be amongst others who understand and can often help with specific problems as they arise.