The guilt is eating me up

Nearly 3 months since I lost my baby girl at 4 days old. I feel like I’m going crazy, The more time passes the harder this feels. I replay the night in my head over and over and try to figure out where I went wrong. I had a bassinet right beside my bed yet I fell asleep with my daughter beside me or did I choose to … honestly I can’t even remember I was so tired that night but I hate and regret that I did. Some days it plays over and over in my head i feel like it’s my fault and I “accidentally” killed my baby because I was careless like how did I just fall asleep?? I spent months trying my best to bring her safely into the world dealing with a short cervix and PPROM and when I brought her home I lost her. I woke up to her beside me still in the same spot she was when I fell asleep she was on her back but she was bleeding from her mouth and nose. children’s aid spoke to me twice and the lady told me she spoke to the police and the coroner and this doesn’t look like her death was caused by co sleeping it just looks like something shut down in her little body and we may never have an answer… but it makes no sense to me she was perfectly fine before bed all I know is she slept beside me and I woke up to her gone. I have two older kids I slept with them from time to time. I have a huge family and know family members who have slept in more dangerous conditions then me so why my girl I was more careful than most people I know. nothing makes sense. How do I deal with this guilt I honestly feel like I’m losing my mind. I just want her back