Need help

I have a friend, and no its not me, that has a 3year old daughter. She had her with her Ex-boyfriend in Virginia, and her and her ex both have moved out of that state now. and they are both living in separate states. the child custody agreement states they share custody so until the daughter starts school every 4 months she goes to the other parent. right now the father has the daughter, and my friend got a call from the fathers girl friend, and she told my friend that the baby that the father and his girl friend have together got hurt while the father was watching both children. it wasn't bad but bad enough that the hospital made a statement of parental negligence. My friend is very worried now about her daughters safety. but by the custody agreement she can not just go and take her daughter, and she doesn't want her daughter to be taken by CPS if she calls and asks what to do. How can she work the system so she can go and pick up her daughter, and get full custody of her daughter? the father isn't the best parent but he has never done anything until now that actually hurt one of the kids, so this is why the court split custody in the beginning. any help would be great.