what would you do?

So a coworker of mine who I've become really good friends with has opened up to me and some other coworkers about her abusive boyfriend. We've all offered her things (place to stay, cars,etc).  She has two kids with this guy and he is emotionally abusive to them and they're only 11 months old and 2 years old. I know she wants a way out but is too scared to do so. And she's afraid she might lose her kids. I've had this situation before and someone called CPS and they ended up better off because of it. I was wondering if maybe I should call CPS anonymously because I'm worried about the children and the other day her son got burned on their wood stove because her bf wasn't watching the kids. 
Idk I just want to help but am not sure how