Three most likely things are retained placenta, ketosis, hypocalcemia. Start by taking it's temperature to determine if it has a fever. Normal is 101.5-103.5 fahrenheit. If fever, it could be an infection from retained placenta if the placenta didn't come out. Hopefully this video is helpful in determining if it's ketosis or hypocalcemia: https://youtu.be/vjaZolhJZTA?si=YCOjVobv1i0tJ9wd
Unfortunate update: she did not make it through the night. Felt somewhat optimistic last night that she was moving a bit but contacted a livestock vet anyway. Unfortunately she took a turn and was gone before we even got a response. Tough loss for sure and I’m thinking there’s a good chance it was a retained placenta as you mentioned. Costly lesson learned but we’ll be better prepared for our next lambing which could literally happen any day. On a more positive note, the lambs are doing well. We’re quickly shifting to bottle feeding and they seem to be adjusting to it fine. I really appreciate all the help and quick responses from this community! Really amazing to see what can happen when you get good people on a free platform. Thank you everyone!! #grownostr