If the solicitor has been given the responsibility of looking after the property, she obviously must ensure it is kept in good repair. If no member of the family is prepared to share the responsibility of deputy ( yes, "deputy" is right , or at least it was, since I was a deputy a few years ago for my father's affairs) then she has a responsibility to the estate, and ( presumably, eventually ) to the heirs who will inherit the house. If nursing home fees are required, she may take it upon herself to sell the house and invest the proceeds with a view to paying these fees.
Or she may consider it appropriate to rent out the house to help with the fees. If you have given her carte-blanche to deal with the estate, this solicitor may do all sorts of things. Only by one or more members of the family taking her place, or being joined with her, can you ensure the estate is dealt with in the way you prefer. If she is also named as executor of the lady's will, her fees could be astronomical. I do urge you to take back the deputyship if ( say) two members of the family can agree to share the job. It is a great responsibility, but it need not be a burden.