I think, as a provider, if a parent told me they had a sensitivity to it, I would not mind leaving perfume for the weekends (I don't wear it anyway, but if I did). Most workplaces are nwo scent free, so it doesn't seem out of line to me that this could be extended to our workplaces which happen to be our homes. Of course, she has the right to say no as she does make the rules for her daycare, but then you have the right to look elsewhere.