The father sounds like bad news. I feel really sorry for her and the child. It is sad that he is holding her back from success in life, probably because he wants to control her, and the comment about having sex with her co-works is an obvious indicator of jealousy. She needs to get out of there before it gets any worse. At least they are not married, so she won't have to arrange for divorce. But custody battles are difficult, and if he wins visitation rights, she may not be able to leave the state. Unless there is proof of abuse, there is not much she can do to keep him from getting partial custody. There is also the possibility that he could be awarded sole custody because he has a job and she doesn't. She really needs to get on top of this stuff if she wants to make a positive change. And especially if there is physical abuse happening, she needs to get out of that house right away and get to a safe place. The evidence collected by the shelter could aid in her custody battle.

I wish her good luck.

As far as what you can do, you can only encourage her to do what she needs to do, support her from a distance, unless she asks more from you. I wouldn't focus on getting back into a relationship with her at this point - her life is already complicated enough. If you do still have feelings for her, let your actions speak for themselves and hopefully she will see what kind of man you are and decide for her self, and for her child, what is right.