gavra at work:
In regards to the issue of the story of R’ Shach zt”l, I was thinking that even for a man to ask a question in learning (out of the beis medrash) would be a bit funny, but I decided to stick to the specific case, (I didn’t want to get myself into trouble here). But thanks for making the point I didn’t, so kal vechomer, it is inapropriate for girls!
but your last point, “(I would not blame the girls in this case as their “teacher” (probably the sort who says that you are eating Traife if you don’t have two sinks) told them this was the right thing to do, instead of the teacher asking her Rebbe or husband.)” I think is neither here nor there. you have no reason or basis to make such an assumption. In all probability, it was NOT their teacher who told them to do this, at least I hope not. why do you assume a teacher advise them to do such a foolish thing?