I always get the wonky friendships

So I have a friend who I just met in August everything seemed good with her and she was normal (i've had a lot of bad luck with friends so I'm careful about who I end up hanging with) she was a sweet girl with a new baby and we got along pretty well. About 3 months into our friendship she calls me crying midnight begging me to come over and I wasn't busy and couldn't sleep anywyays so I went. When I got there she confided in me telling me her husband had grabbed her by the throat that night and left to go out drinking with friends... Weird. Especially with a new baby I kind of wanted to call cps it was my gut decision. She started telling me more.. How he beat her while pregnant and put her in the hospital at 36 weeks and every one thought it was a kidney infection (didn't really add up for me but not gonna say she was lying no proof) also said that before they got married he cheated and gave her chlymidia (should have gotten away then imo red flag) I told her she can call me if anything else happens in the next week or two but I wanted her to contact her mom (she lived across the country out west) and leave asap and if she didn't I planned to call the police and leave an anonymous tip I was worried!!! Okay so about a week later she was on tinder (smh I know) then also found out that her husband had cheated on her a few months ago while she was 30 weeks pregnant and out of town (who cares she's leaving anyways and is now on tinder) I told her not to mention it to him and focus on leaving. Of course she brought it up to him and he got so angry she says he threw a toy at her and bruised her wrist. That day she went to the emergency room and filed police reports against him. I was so happy for her and helped her out as much as I could. Packed up all of her things with her, drove her to the airport, let her stay at my house that night, drove her to the bank all to help her out. Out my self inna potentially dangerous situation (her husband was out and about and drunk) to help her and her baby. She finally went back home (across the country) I don't see one word of thanks.... No calls to see how she's doing... Can't even like a picture on instagram or send a txt... Then I went on snapchat (back when you could still see who people's best friends were) and guess who her best friend on snapchat was???? HER ABUSIVE HUSBAND who loves across the country. She didn't need to be talking to him!! I messaged her telling her I saw it and she acted like I was so stupid and it meant nothing (finally replying right?) so I blew it off I figured hey this girl doesn't care about me or herself I'm done trying I can at least be civil ya know at least I helped her and her baby that's what matters is they're safe? Then literally 2 weeks later I get a text from her guess what it says?? "Hey.... I'm back here with my husband (in other words she's taken a plane and came home and is 5 mins down the street again) thanks for the help hope your not too upset and we can be friends" WTF??? So she means she came back to her abusive husband after a month. That's a vacations time! I didn't care anymore and didn't want to fight beucase my husband works with her husband so I just distanced myself from her trying to spend as little time as possible with her until she took a hint. She tried to hang out with me all the time (all of a sudden her phone works now that she's back right??) and I would sometimes say ok because I knew I was moving soon and wanted to just not add fuel to the fire but I never told her anything important about my life and if she tried to confide in me I would quickly change the subject. I also found out her husband had sex with a girl at a party the day before she got home... Which if she was contacting me I could have told her BEFORE she came back! But hell no I wasn't about to be the cause of her taking another vacation... Anywyas since then she's gotten upset that I didn't hang with her as much and blocked me on facebook, weird because she's done much more to me without being blocked but oh well. Anyways my main point of this post is her and her husband are trying to get pregnant now, and acting as if their relationship is perfect on Facebook. I think it is such a terrible idea it makes me want to talk to her again just to make sure her daughter is okay cause I feel like her best interest is not being met. Did I do anything wrong in this situation? I always feel like I could have done more or is she just not able to be helped?