baby chick fell from top of their coop

[IHT]

i have 1 baby chick that is not thriving like the others its almost 3 weeks old and it still looks like a newborn chick she spends all day chirping loudly and sometimes goes and eat their feed & water.
2 days ago since shes so little i was feeding her alone on top of the chicken coop but when i saw she was full i took the feeder inside the coop to feed the other chicks...she tried to follow the feeder and fell down.. i almost thought she died because that was a very loud thud but hours later she resumed eating alone doesnt seem lo have any broken bones and poops normally but continues chirping loudly and closes 1 eye.... anything i can do to help her ? i have her isolated with another healthy chick with plenty of feed &water

 

[Brooks_]

If it is 3 weeks old, I would cull. I am sorry. I know that is not what you wanted to hear.

You could try some nutri-drench to see if a boost helps. But really it looks a few days old.