Abuse while in dcf custody

While in dcf custody grandchild has been sexually assulted twice, ran away countless times , most times to my house, physically and emotionally abused by staff, moved 5times since2020.refused to return custody to me after mom refused custody, made it imposssible for me to visit with her. Her father my son is deceased since 2012. I have financially supported her and her siblings. Dcf gave temp custody of her and her two sibling in2020. Now they are refusing to give her back to me, None of the things that have happened to her under dcf every happened when she was with me.