a bit too much drama

Im pretty close with a girl that lives close to me in my apt complex. At first, she was a really cool chick, but lately she's just not so cool. She's 5 months pregnant and me having 2 kids myself, I understand that making you pretty hormonal. But this chick comes to my house everyday with some new story about her baby's daddy and what him and her fight about every damn day!! Apparently this guy is hitting her, then she comes to my house and tells me all about theyre fight and evderysingle thing he said and did, but she doesnt wanna call the cops and dont want me to! Im going against my better judgement by not calling the police myself, but Im scared that she might get into trouble and loose the 2 children that she has now, but at the same time saying that, why isnt she worried about the life and health of this third child. When he isnt smacking her or screaming at her, she said he also does crazy shit like write notes that say things about the devil and the baby not living. I havent ever heard of any shit like this!! When I was pregnant with both my kids, my husband would rub my belly and talk to the baby, put my shoes on for me, and push me up stairs so I wasnt as uncomfortable! I was tripped out when my cousin's wife was pregnant and he treated her like she was just normal and didnt baby her. This shit has me gone trying to figure out what to do! I wanna be a good friend and keep her secrets and problems to myself like I would want a friend to do for me. But on the other hand, I need to think of this baby and its wellbeing first. Im so confused and scared. She says that they finally talked everything out and decided to not be together (thank the Lord!) and he packed all his things up. This was yesterday. And then today I was outside with my kids while they played and I seen him standing in her doorway in his night cloths looking out the door.That makes me think that he is still living there and she just wanted to make me think otherwise cause of the worrying Ive been doing. What to do what to do.