Try not to beat yourself up... You did the best you could when you did find out - especially since you didn't know she was pregnant. It's unfortunate, but given the circumstances it doesn't sound like you could have done anything differently. I hope Belle Recovers quickly!
At least we found her when we did she could have died. And I wasnt there my dad was. He had to pull th dead lamb out. Its hard I am praying for belle to be ok