Its a very difficult job in brining up girl child. Girl child should be brought up so that she can live in a hut or live in a palace, mean to say she should adjust with husband whoever he is, cant expect each and every man to be Raj Kundra or Vijay Mallya.
Now so many years have passed away. The woman has already gone to police station, what else she can do? She can file for divorce, file DV case, File host of other cases including forcing for unnatural s*x.
At this age going to court? Judges/Magistrates will be 30+, it will be so shameful to go stand in front of a baccha and ask for justice.
Another major thing I have notices in women is, their mouth wont shut, they keep bickering, thats the main reason for all the maar peet/ladai jhagda.
One more thing is, jab tak sunne wale rahenge, tab tak sunane wale rahenge, the more you lend your ear to your sister, the more she will confide/complain. 20 years over and she is still not able to handle her husband? I say you better keep quiet, and ask her to control her tongue and adjust with husband by showing him love and affection. or can approach local lawyer and be ready to file divorce/DV/498a/Maintenance etc .