I think I have figured out what was ailing Eve. Like humans, alpacas are born with a meconium plug that MUST come out. Friday morning I gave Eve an enema, and thought she had passed the entire plug. Today, worrying and worrying, I was sitting in the field with her, observing. She went over to the poop pile and strained and strained, making little grunts. Hmmmmm, could it be that part of the meconium plug is still in her intestines? I went in the house and prepared an enema for her and administered it. Then I laid down in the grass next to her to watch what happened next. After about 15 minutes, she stood up and propelled a mass. Wooo hoooo. She pooped, she pooped. We get so excited about these things. And just to be cautious, we gave her a dose of mineral oil to keep thinkgs moving . Sometimes an impaction can form at the entrance to the spiral colon, which eventually bursts and you have a dead cria.
I will report in the morning on her status.