My rhode island red/australorp mix pullet (8 months old, began laying at 5 months) seems to be losing LOTS of weight. She has a VERY prominent breastbone. She was broody for a month, but has been off the nest for a month now. I don't think she has begun laying again. My six pullets are in a run full-time and have access to their coop at all times. We close the coop door at night to keep them safe from predators, although it would be unlikely that any could get into the run. They have several inches of dry straw in the coop as well as a perch. Mostly they prefer sleeping on the straw. The last week this hen has neglected to go into the coop at night. I pick her up and put her in before I close the door. They are eating layer crumbles with a bit of food-quality DE added. 17% protein, 3-4% calcium. The package says it is a complete food for laying hens with no need for extra calcium or grain. I do treat them to extra greens (small tender leaves from the yard and table scraps from our salads -- no dressings -- and whole wheat bread crusts). This hen's stools are runny. She doesn't appear to have any injuries or other obvious problems. She just isn't acting right -- she is unenergetic and like I said, her breastbone is getting extremely prominent. Probably sticks out from her body an inch or more. She is wasting away. Please help me figure out what's going on! Thanks!