The woman on the right is a peasant, the picture is taken at Mogilev, if I'm right. The girls visited peasants there, and took some pictures. There are two more pictures of Olga and Anastasia, in one of them they're helping a boy in a pit, or so. There's also one with Anastasia and a littte boy. If you don't know which pictures I mean, I'll send them, but I guess they're not so rare.
About washing their hair, I thought they did it once a month.