Hi @lauralb welcome to the Connect Head and Neck group. It seems that your mom is in that limbo of treatment area which happens all too often in some areas of the country sadly. My suggestion would be to hound everyone involved until someone takes action or gives you a solid answer as to why no one is taking care of her.
I have little experience with dermatology other than to realize it has been specialized primarily for acne and cosmetics for the most part. But when it comes to confirmed cancer, the oncologist should be getting involved and should take over driving the bus.
You might consider going outside your local area, a university hospital perhaps if you’re not getting any action.
Let’s see if someone else pops in here with some experience in MOHS on the scalp and the route forward. In the meantime make some noise and have courage on this path.