To say you were only renting a cabin in the area, you should be proud that you helped with the delivery of these poor lambs, and that you had the joy of feeding a baby lamb for a few months, and gave it all the love that you did.
Just to let you know, we do live on a farm, and before we got our own sheep, I used to take orphan lambs from a neighbouring farm, as if a lamb had twins and one was really weak, the farmer would throw it live into the woods forthe fox, to guarantee that the other one would be strong and make him money (sad but true).
I used to take them, but most of them did not get their mothers colostrum (this is the first milk that the mother produces, and is full of antibodies and makes the babies resistant to illness).
Because we bottle fed them on powdered milk and powdered colostrum sometimes too, quite often they would die within a few months, just because they did not have the resistance - so it is quite possible that the lamb might not have made it into adulthood anyway.
What I am trying to say is, don't beat yourself up for not knowing - it could have died anyway from not having enough resistance to the germs in the land.
You should be proud, and happy, you had a wonderful experience that many people never have, you delivered and raised a lamb by bottle - you did a great job - well done you!
Julie