<human>: I'm not even really sure where to begin...

I have this friend (I promise it's not me!). She's 26 years old and has been married for about a year a half. I've known her for almost 9 years now. She married this guy she knew for about 4 months. All of her relationships have been toxic and/or abusive. She didn't tell me that she was getting married and I hadn't even met the guy (I think she might not have wanted me to try to talk her out of it). Anyway, he turned out to be an alcoholic, abusive, and emotionally distant. She's stayed with him, mostly because she doesn't want her marriage to fail. A few weeks ago, he hit her hard enough to make her black out and split her lip. The whole situation is terrible and I'm terrified for her but there's not a whole lot I can do if she refuses to leave him. I can't make her. She's an adult. 

Anyway, yesterday he found some incriminating text message on her phone and flipped out. She locked herself in the bathroom and he took off. We spoke (briefly) today and she mentioned that he told her it was over and would be dropping off their apartment keys later this afternoon. I haven't heard from her since. I've called and texted and called and texted but I can't reach her. Quite frankly, I'm REALLY worried but I'm not sure if it's at the point where I should call the local police or not (or even what to tell the police for that matter). I would head over there myself but I moved 100 miles away a few months ago and I'm a single mom and my kids are sleeping. I don't know what to do and I'm ridiculously worried. I have her husbands number but I'm not sure I should call him. 

Can anyone give me advice on this matter? Please? I'm so worried about her.

Summarize the given text in a few sentences.
<bot>: Friend is in an abusive marriage. Had a blow up with husband last night and haven't heard from her in hours. Need to know if I should call the police or contact her husband directly. Worried.