We have a three year old ewe about five weeks off lambing, she is carrying two but not heavy and is in good condition. A few days ago she started moping about in the pen while the rest were feeding silage, she is also keen on going for regular sips of water. I gave her a high energy/vitamin, mineral drench the first evening which helped a bit, but not a cure. She is eating for a brief period and then stepping back, moping about looking a bit sad and drinking every so often. She comes forward to eat meal (concs) but only nibbles really. She doesn't really fit the bill for any of the obvious problems, any ideas.