I'm glad to hear she's doing better.
Being weak, dehydrated, or malnourished can be a vicious cycle. If the other chicks bullied her and wouldn't let her eat, then she got weak and less able to fend for herself....the more she NEEDED the food, the less she could get to it.
Now she has you to give her TLC and a possible chance of recovery.

Now she has you to give her TLC and a possible chance of recovery.