I am so sorry for your loss. It's aways hard when they don't make it but it's not your fault. You did everything possible to save her. She is no longer suffering. Sending hugs :hugs :hugs :hugs :(
Please don't give up on this baby, you are just now finding out to give some things you weren't giving. Try for at least a few more days. I am rooting for you and the chick!