hmmmm this is a tough one. First I think its a little odd that she is wearing so much to begin with working all day with little children that are typically more sensitive to smells. Second you have to say something because it will drive you crazy. But third, you would probably offend her because really there isn't much of a nice way to say it. Maybe just tell her straight up-pray she doesn't get too offended, and try to make it a light situation if that makes any sense.