I thought about this during Chag and I thought of another thing.
Growing up, tznius is really shoved down girls throats (and I do mean that almost literally). Have a spare moment? Lets talk tznius. Mussar time? Almost exclusively tznius. Teacher allows an off topic day? Steers conversation towards tznius.
I think to a certain degree people stop listening when its just too often. There’s a saturation point where its INEFFECTIVE. I think this has only gotten worse since I’ve left school (after discussing this with my older neices). I think schools are overdoing it and concentrating too harshly on tznius. Perhaps if they stepped back a bit, girls might want to do more.