Where oh where do I begin with this story. My friend knows I'm posting this and I'm technically posting on this on her behalf. But I just don't know what to do .
During my time at University, I met this girl ( my friend) which we shared a lot in common with, we're going through similar stuff in our lives, similar interests . All in all, we jelled really well and she became one of my very best friends, she has honestly been my rock with all the stuff I was going through my abusive ex, by my side when my DS was diagnosed with SEN. She is has just been an amazing person.
In her current situation, I just don't know how to help her 
. She's been with her current BF for many years ( now husband), he has cheated on her multiple of times, was very rude to her... just not a very nice person. Though the husband's mother is worse ! During our time at University, the mother in law will continuously ask money from my friend, my friend will "loan" the MIL a few hundred quid there from her student loan, she even " lent" her 2 grand ( the MIL has never paid her back !) one time. I pleaded with my friend to stop doing this but she felt like she had a duty to the MIL.
My friend sadly had MC during our final year at Uni, she was very distraught , I supported her through this. This was round the period that the Bf (not husband) and the MIL was pressuring my friend to get married to her son (bf now husband). The MIL used her MC against her and told her that "she committed sin and it will be better for her son and her to get married". I pleaded with my friend to not do this, God knows I begged her not to, the husbands family were horrible to her, the husband just smokes weed all day, plays video games, spends his money frivolously, talk to other women. He just wasn't husband material.
Though my friend went against this, she left her family home to be to stay with her husbands family. The MIL suddenly got them married (without them knowing they were going to get married - very long story). The MIL made my friend cut off from her family members, she wasn't allowed to speak to her mum, sister, father, anyone ! The MIL threatened that if she did she will get her and the husband divorce. As my friend loves her husband so much, she obliged.
Her coming to University was difficult as the MIL also forbid her to attend, through fear of her contacting her family but she allowed her eventually. As you can imagine my friend was depressed and the husband wasn't helping too. Not long after, she was pregnant, she was very happy but in my head I was devastated for her, I knew she wouldn't leave him and that family any time soon and things were going to worse and they did .
Whilst pregnant she had to cook and clean, she wasn't allowed to go out. ( her mum commands). The husband is scared of his mum so wouldn't tell her off otherwise. My friend was coming into uni exhausted, sick, crying. I tried to help her and advice her, I told her there was more to life than this but she couldn't let go... she didn't want to let go of her first boyfriend she has been with so many years. Plus I think the was secretly hoping that one the baby arrives, then all will be ok. Due to all the stress above she wasn't able to complete her degree in the end.
Long story short, my friend had the baby, the MIL is not so controlling anymore, she has even told my friend that she has regretted them getting married. My friend is in contact with her family but she is depressed, she still has to cook and clean for 5 people and look after her child too, the MIL helps occasionally, the husband is at work but it's too much for her. The husband has started becoming physically abusive towards her, my friend suspects his speaking to other women. He doesn't help it much with the baby, mainly on drugs (weed), wastes money, just still the same.
I've advice my friend countless of times, told her about organisations spoke to her family. I told her not to end up like I was as I too found it very difficult to leave my abusive ex. She says she will leave but when something "good happens" (e.g. The MIL is nice to her, the husband is in a good mood or whatever) she backs out and stays. The sad thing is, she is only 24. I don't know what to do. Can anyone advice ??