Sweetie went through it all with my 18 yr beautifull Muffin, you are whipping yourself darling, as we all have done, your vet has seen it time & time. You could not do more than your best. Stop punishing yourself, it's gonna hurt for a long long time, you were a fantastic mum, eventually you will stop thinking why did I not do.... & start the wonderfull memory magic of your lil ones memory,,,, which will never be forgotton.
You talk to us about what lil one was like & lil ones mischief, cos we are all here to listen, laugh & cry with you.