"Yes of course she is entiled to ring the solicitor."
Actually, no. She is not entitled to ring the solicitor. The solicitor takes instructions from the executor who, presumably, is neither the grandmother or the mother and can only communicate with the executor and the beneficiaries. Now, grandmother is unwell but
A. Having Alzheimers is not a disqualification from inheriting
B. Grandmother gets inheritance and it is then part of her estate when she dies.
C. Technically, grandmother cannot give a receipt for the funds because of the Alzheimers
In practical terms, what happens is proper enquiries are made, and some sort of arrangement will be reached as to how the monies are administered for the grandmothers benefit.
mf