Our 3 year old buff orpington, Mrs. Pickles, isn't drinking as much as the other girls in the flock. She was dehydrated and had a swollen eye, so she was away from the flock for a week. She's been back with them for a week. She isn't being kept away from the waterers and we've added electrolytes, but she still isn't drinking as much as the others. How do we make sure she's getting enough water?