If you could give me some more info, I might be able to help. My husband and I fostered over 100 children and adopted 5 "special needs" children , all of whom are just about grown now.
There are lots of thing to try for behavior problems. Some work and some don't. It depends on the child. It is such a lonesome feeling to be the parent of "the unruly child". Other parents and alot of teachers treated me like they were thinking "Why don't they do something with that kid?" And I was even told a couple of times, "Boy, if that were my child, I wouldn't let him act like that". My "active/busy" children never had friends either........sometimes because parents wouldn't want their child by mine. It's not your fault. Write if you want.
You don't really give a lot of information in this post.
It sounds like you were 16 or 17 when she was born. Did her father, or does your family, have mental health issues?
What is her life like now? Are you married to her dad? Is her sister her full sister?
Sorry to ask so many questions - it's important to look at a child's history when thinking about their behavior.