I want to repeat something that I said earlier:
I actually find the scenario very plausible. We didn't have gentle body washes and things like that when I was a child, we had just soap. I can remember numerous times having my private parts burning after a bath (from washing myself without any help) and I remember doing a lot of rubbing of the burning area too.
I am STILL sensitive to various forms of soaps making contact with that area. I have to be careful.
I agree with everyone else that mom simply does not "get" the responsibilities of a mandated reporter such as a school nurse, which is more than a bit disappointing.
Personally, I think that she is so upset about the embarrissment/upheaval/trauma to her family that she is not thinking straight.
I think perhaps that what is the most upsetting to her, even if she doesn't realize it, is the fact that she is going to have to continue to deal with the people that called CPS on her family...at least as long as her child attends that school.