I’m in a very tricky situation

I am 22 live with my partner who’s 24 we have 2 Kids together aged 2 and 4. We also have my sister living with us who is 17 (nearly 18). She moved in with us a year ago after suffering with her mental health when she lived with my mum and our brothers (17+18 at the time).

She moved in with us because she attempted to take her own life twice in the space of 3 months. Her house was chaotic she was depressed and no one cared about her she was around our alcoholic mum and 2 brothers who are into drugs and crime bringing anything and anyone back to the house. I knew about this all and she would regularly stay at my house and at our dads or at friends so she didn’t have to go home. But she still had to go home at some point. Then lockdown hit and she was stuck there for a year basically as she couldn’t just go round staying at other peoples houses as it wasn’t aloud. She got worse and I couldn’t go there to get her up so it became increasingly harder for me to get in touch with her because she would just ignore me and there was nothing I could do. No one checked on her they just let her stay in her room all day and sleep all day and didn’t know if she was eating or drinking just left her and she fell into a depressed spiral.

When all this came out and she attempted to take her life the first time I was the first one she told because she was scared she was going to die to we obviously had to tell our mum and she didn’t take the news very well. Handles it the complete opposite to what she should have. Anyway. We got her through that mum said things would changed etc etc. They did for a couple weeks then it all went back to ‘normal’. She attempted to take her life again. This time she told her friend and not me but her friend told me straight away when she came out of hospital she came straight to ours and she’s been her ever since. we got her the help she started therapy. Then after about 6 months she was put on anti depressants and sleeping tablets. They helped. Very long story cut short she has stopped her medication and therapy she is doing so good she has a job and started seeing this boy now she’s pregnant.

She’s in 2 minds if what to do and given her mental health history she doesn’t think she could live with herself if she ‘killed her kid’ as she put it but I’ve told her it’s not that at all and she needs to take all aspects of her life into this massive decision. The dad is involved and he Wants the baby but they aren’t together and never were so it’s difficult in that aspect. She live with me in our 3 bedroomed house and has no where else to go. I told her we can get through if she decided to keep the baby we won’t kick her out but y time the baby is one she will have to go I think. But then hopefully she would be settled into it and have enough saved up and sorted out.

She also is worried about keeping it because if her mental health took a decline aswell and she got unwell again. So she’s stuck in the middle: and I don’t even know what’s he right thing to do. She talking like she’s going to keep it. But I haven’t asked her yet:

What would you advise?