Best Friend

So my “best friend” 21F, I’ll call her Macy and her partner 27M, I’ll call him Lance.They have a two year old daughter together, Emma. When Macy found out she was pregnant Lance insisted that she keep the baby, after her first appointment she had Lance chose not to speak to her for 8 weeks (she was as 8 weeks pregnant when she found out she was pregnant). So when she was about 16/17 weeks pregnant she told her parents because she had moved home during COVID and they kicked her out, she ended up purchasing a trailer which Lances parents allowed her to have in their backyard; the was no water hooked to it, no heat or air and no hydro. Lance slept inside his parents house at night leaving Macy in the trailer. They ended up getting a place together and Macy moved in immediately - it took Lance a month before he would even spend the night. During their course of time living together before the baby was born Macy found broken off fake nails in her bed, different coloured hair in her bed and Lance used her credit card to pay off his $20,000 worth of debt that he promised to pay back (Spolier he still hasn’t). They ended up moving into a larger place about six months after Emma was born, Lance did not help with household chores; sweeping, dishes, kitty litter, laundry etc. he refused to help feed Emma or change her diapers. Macy had been saving Emma’s child tax credit to put towards Emma’s future education, one day Macy said Lance couldn’t borrow money so he waited till she was asleep and transferred al the money to his account. He gives Macy $500 a month for bills; he makes significantly more than her and their rent alone is $2000, Macy is not allowed to see his banking because the last time she did there were transactions for Only Fans and different porn sites. Macy found a baggie of drugs in Lances pants while she was doing laundry with Emma by her side. Macy constantly ‘hotboxes’ her vehicle with her child inside; always has a vape in her hand. Her vehicle is filled with so much trash that it has its own ecosystem and you can smell it before you get in. I have offered to help Macy many times with issues in her life, just a few weeks ago she saw dating app notifications on his phone but has ignored them. Lance and her constantly fight but she insists that they can’t break up because it’s not good for Emma if they were to. My question is what would you do?