We've had two C sections and both times the ewes have taken the lambs, even though one of the ewes was very poorly. The first one was a gimmer with a huge single and she was up and about in a few minutes and feeding the lamb as if nothing had happened. The other ewe had triplets, only one of which survived, and we had to latch the lamb on every couple of hours to feed as the ewe couldn't stand. The vet was very keen for the lamb to suckle as it helps the uterus contract and helps to prevent infections.
Hope your girl is OK - as others suggest, maybe oxytocin will help and once the milk is through the lamb, it will smell like hers and she'll be happy to accept it.