Daughter 19 emancipated child support continues

2014 I went to court filed for custody. My oldest I was able to keep. She was living with me anyway since cys got involved due to drugs in the house and some abuse. At the time my youngest who was 15 at the time also had a live in 19 year old BF. The constable found him in the closet in her bedroom. This all went to court including the constable. Why they let her stay with her mom I don't know. At the time they said she was old enough to decide. She liked to party with her mom and now she's in rehab. Butler county juvenile has her in for the second time. The first time she went in she was 18 and she was still in high school. I was paying support to her mom. I stopped paying support to her mom since she was not living there. Soon as I did that butler came at me for support. She got out and I was paying the arrears for that while again paying her mom. The arrears were paid off and then my support juSt stopped because washington county domestic relations emancipated her as she was 18 and graduated. The week they stopped the support she ran to butler saying she was hot for drugs. THE WEEK MY SUPPORT ENDED! I figured this would happen. Anyway I enjoyed about a month of not paying support and just got the letter from butler setting up suppprt for "the minor". I am in the process of getting an attourney and would like some advice. She is now 19 and butler says they can make me pay support while she is there until she is 21. I'm trying to stay calm.