definitly bring extra toilet supplies for the girls.
and bug reppellent,some avon skin so soft should make them happy.

one question is do they know what kind of "bathroom" they will be using?

ex: a hole in the ground, portapotty, or those 5 gal buckets with a toilet seat lid etc?

maybe pack a few sleeping pads for under the bags in your tent incase theirs is too uncomfortable hehe.