Just had one with these symptoms die this morning :( cried my eyes out and had to stay home from school. Check her crop and see if it is mushy or too firm. She may have sour crop.
I think the bonding thing is just a matter of their personalities. Each chicken has different likes and dislikes. They may bond, they may not, but as long as they don't completely hate eachother I think they will be okay
I'm having the same issue. I got two new suuuper *sweet little chicks 3 days ago and because they are to young to go outside to meet the others (we have 5 older hens) I decided to bring our nicest hen inside to see what she would do. Total mistake. She immediately pecked at one but I pulled it...