My mom has ppd and I want to help

Hailey

So I’m 17 and my mom had my sister about 15 months ago. Shes been suffering from ppd ever since but she’s not getting better. She’s in therapy and she’s on anti depressants but I swear shes just getting worse. She has 5 kids and I’m the oldest. My dad and her are still married but they’re only together for the sake of us kids. They fight all of the time, sometimes i don’t know if she loves him or is scared of him. But she won’t leave him. My dad is emotionally unavailable, so when it comes to parenting hes pretty much absent despite being here and yelling at the kids sometimes. So I help my mom take care of them. My younger sister is 14 and is currently not doing the greatest mentally. She was just put into a mental health facility and my moms been taking it hard after finding out she won’t be home for Christmas. My other 2 siblings are 10 and 6 and they just don’t listen. They don’t behave. They’ll sit there and listen to her scream at them and ignore her. My mom is overwhelmed and stressed and she’s struggling. I’ve overheard her on the phone with my aunt saying she feels like she’s a failure and like she’s a bad mom. I feel horrible. I try so hard to help with what I can but I’m having a hard time too. My best friend passed recently and I’m not doing the greatest. Plus I’m a senior so for a large portion of the day I’m doing school. I help with laundry and I clean and I take the baby so she can shower but it’s not enough. I know my mom is struggling. She’s said that she’s worried she’s going to pass away at a young age because of how stressed she is. I’m terrified of losing her. I lost my best friend, 2 great grandparents, and my grandma this year. I cant lose my mom too. I don’t know what to do or how to help. I feel terrible, it’s like I’m just watching her drown. She freaked out on me tonight while crying because I accidentally forgot to close the milk. She called me into her too like an hour later and just started sobbing and hugged me apologizing for it. I just started crying telling her it was okay. I don’t know what to do. If you ppd, please tell me what helps you or give me some advice on how I could help her. It’s 1am and I’m bawling typing this because I don’t know how to help. I’m just so scared of losing her.