Sometimes we'll call a mother who hushes it up irresponsible but you have to look at things from her perspective too.
In my culture if a girl is harassed and her dad or brother find out they would kill the guy, literally, slash his throat or shoot him with a klashnikov.
If this sort of thing happened in our culture and the girl told her mother, her mother would think twice about raising alarm because she'd know what her husband or sons would do which would put them in jail or hanged till death.
Another issue is that a rape victim wouldn't get any Rishtas (marriage proposals), I know that's ****ed up but that's our Pakistani society for you.
So the poor woman is left between a hard place and a rock. She can't tell and she can't stay quite.
Molestation doesn't just happen to girls, I'm a boy and I remember once during a vacation to Pak when I was 7-8 yrs old, a 16 yr old boy servant would touch my bum, I was way too shy to tell anyone (thankfully it didn't have any negative implications though, now that I think of it in a way it kind of felt good).
I also had an older far of cousin touch my willy through my shalwar a few times, that was horrible, he'd squeeze it really hard it hurt..