Omg, VENT: I just want to put my 13yo niece over my knee so freakin bad!!!

This girl is suffering from a severe lack of discipline, and always has! I get my sister suffers from depression, but you'd think at least her husband would do ANYTHING!! She finally got arrested for the first time this past week, no one knows why because I guess they're too ashamed to tell anyone the details... But this girl goes on FB talking about "hahaha they're going to make me sit in a cell for a few hours to 'think about what I did'". And now today I screenshot a post to her dad where she's on there talking about "guys sure want their dick sucked but when it comes to licking the pussy they sure start acting funny". And these grown freaking men are commenting on it!!! So now she's unfreinded me. Idk how in the heck she still has phone or internet privileges! Her parents never take them away, ugh. I just want to cry. Our other sister tried talking to this sister about 6 months ago with concerns... And she won't talk to her any more... I have no clue what I can do. 😢