What a horror story! Help should be available from several sources.
Our City Attorney has a whole division just to deal with domestic violence, with victim advocates assigned to each case. The Police Department and DA's office also have similar divisions with victim advocates. Has she ever taken him to court when he attacked? Didn't they assign her a victim advocate? She needs to contact those officials where she lives and find out what resources are available. The victim advocates I used to work with helped DV victims with education, shelter, employment, social services -- anything and everything -- to be able to build a life of their own independent of the abuser.
Her attorney should have seen to it that the children's interests were represented as well. A guardian ad litem should be appointed to look out for their interests. As I understand it, this guardian (an attorney to represent the children) is paid for out of public funds.
It is so hard to think rationally when one is in such a situation. But she needs to step back and look at the situation as if she were looking at someone else and their children. Would she not recommend that they get the children and herself and everyone else out of harm's way and start a new life out of the reach of the abuser?
There are websites with escape plans which you should look at.
Praying for their safety,
SandraC