I hope everything is going well with your chick. I don't think anyone really understand how chickens think but I think you should try boarding them together if you haven't all ready since chickens don't like being alone and can die from the loneliness. Plus as I said before it will take some of...
The fact that it is taking water is a good sign. How long has it been since it last ate? You could try some oatmeal in warm milk, or scrambled eggs. You might have to force it a bit at first. As soon as you do get the chick eating again I recommend taking the least dominant hen of the three that...