Elvismad, it's only a short distance to you, it must appear like a 100 miles to your mum. Get in touch with Alzheimer's society and find out what's available. Where I live there is Crossroads, the county family Carers, two villages have fully trained Carers available to help you and there is a transport service, How about a neighbour, maybe someone would walk mum to the lunch club.
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Yes, maybe some local retired person would help for a small fee? Might be worth asking around. Obviously you could not have just anybody, but might be worth a try - forgive me if you know this is just not possible.