Stealing

Help! My daughter is 6 years old. We adopted her officially in May of this year. Her biological parents do have a lot of mental issues, with bipolar, stealing, depression, admitting fault and so on. My problem is that my daughter steals ALL THE TIME! She sees something she likes from a teacher, friend, or brother and instead of asking and being denied or given it, she just takes it. I have taken privileges away from her and even tried taking something from her and hiding it saying someone must have stolen it, so she feels how it is to have something taken from her. She sees a counselor both outside of school and at school, a psychiatrist and even her after school teacher tries to talk to her. I am running out of options of what to do. My husband and I are lost. Please help us get her to understand what she is doing is wrong and if she continues a lot worse than lost privileges is to come...... thank you! :confused: