I’m really sorry to hear about your daughter @Paul42. I want you to know that we’re all here to support you through this and you’re not alone.
You mentioned that you feel like you failed her as a father and I can really hear the pain you’re feeling. Please know that you’re not to blame for what happened. From what you’ve shared here, you truly cared for her so much and did everything you could. It’s not right that child services let you down when you tried so many times to ask them for help, I’m so sorry to hear that happened.
For some people they can find comfort in reading through posts from other members in the community who have also experienced losing a child. There’s a recent post from @misterhyde who lost their son which you may like to read and there’s some more posts in the ‘Losing a child’ section of the forum here.
You’re so brave for sharing this here with us. It’s not easy opening up, you’ve been so brave in doing so and we’re all here to support you through this.
Keep us updated with how you’re feeling, we’re here for you.