@ lauralb, I understand the frustration of waiting for response from a physician's office. You are smart to keep after them. I recently took my 97 year old aunt for a Moh's procedure for a Squamous Cell Carcinoma on top of her head. She had a biopsy in February and was offered surgery or a topical treatment. She chose the one and done surgery. They scheduled her in late May and it wasn't really a typical Moh's as he initially took a full thickness of scalp/skin and then looked microscopically. It was clear so that left her with a 2.5x 3 cm open lesion, since you cannot close a big round lesion like that without a graft. Healing by second intention with it granulating in and shrinking has been a long process as they explained, but it is now 2 months later and about a cm in diameter. Daily treatment to clean the wound and keep it moist with a layer of vaseline and a light layer of vaseline impregnated gauze has given her greasy hair but it has been relatively painless. She was finally able to have her hair washed and water on the wound after about 10 days due to discomfort, tho the nurse had said the next day would be fine. It will be completely healed in another 2 weeks at this rate, and for a 97 year old I think that is pretty good.
I know Melanoma is a more serious cancer and I don't know your Mom's age, but just wanted to share our recent experience. Specialists are so overwhelmed with patient load that they cannot see everyone as quickly as they want to, but perhaps this being a melanoma they might schedule her sooner. Keep after them or get a copy of the biopsy and find another Moh's surgeon. Any luck so far?