Very depressed about my daughter

My daughter and I were reunited a few years ago. I love my daughter with all my heart, but sadly I am so ashamed to have learned that she is a very troubled person with serious issues. I feel as if I am in a nightmare. She is a grown woman in her 40's -with children - and she associates with low-lifes and gang members and is even a part of that gang now. I am so ashamed and heartbroken over all this. I am being advised by my other family members to keep far away from her now. I don't know what to do.