I'm really so sorry for your loss. You did everything you could for your beautiful Samba. Unfortunately death is a part of life and there is nothing to do to delay that sometimes. This was clearly the time. It doesn't make the loss less upsetting but I hope it does tell you there is nothing you should blame yourself for.
She will live with you forever in your memories <3
On behalf of the site team, we are very sorry for your loss. Threads are locked after such a loss as a sign of respect. When you feel up to it, please consider starting a tribute thread in our Crossing the Bridge part of the forum.