Shelley,
Mom's scalp was tender when her hair was falling out. Someone told her to put conditioner on her scalp to keep it from getting dry and that helped. After the hair fell out her scalp was much less tender.
And she complains about how hot her wig is all the time! As soon as she comes into the house she takes it off. Out in the yard she will wear a hat, but if she goes anywhere she insists on the wig rather than a scarf or hat. It was a shock when I saw her completely bald for the first time, but then you get used to it.
Psychologically she has had a harder time with the hair loss than with the physical aspects of her treatment. Of course she didn't lose her sense of humor. If my hair got messed up she'd tell me, :If I had hair, I'd comb it!" Or if someone complemented her on her hair she'll say "Thanks, I'll let you wear it sometime!"
I hope getting her hair shaved will help with the tenderness in your mom's scalp.
Susan