What else can we do ?

my best friend's mom is bipolar and can be abuseive she has 9 kids with 4 mabey 5 diferent dads one of the babies died but she tried to hit the oldest and busted my firends lip last year . my parents want her and so do i but her mom wont give her up when the only reason she wants her is so she can have control she keeps four of the kids away from there father. my mom the school and some other person contacted dhs when the most recent thing happened but they dont do anything is there anything else we can do