And although the girls are alone for several pages of mostly dialog (trialog?), they never mention menstruation. So much for realism.
Given that my knowledge of women generally is at the level where I wish they came with labels like "this side up", I am rather content with the content.
(And yes, I know you have probably written another 5000 words in the meantime. But don't forget the old story about the hair and the purpoise.)