Chicks feathers are crusty and chick seems to have shrunken?

[courtneyripp]

This is my first year raising chicks and one of my six seem to be sick. She used to be the biggest but now she is very little and her feathers seem crusty. Any ways to fix this? I'm not sure if the Pthers are picking on her but whenever I'm around they do not seem to bother her at all. Any help is appreciated. I would hate to lose one of my babies

 

[Wyorp Rock]

Welcome to BYC.

Can you post some photos of her?
How old is she?
What type of food/treats do you feed?
Is she eating/drinking/pooping?

You can add some poultry vitamins to her water, offer wet chick starter, scrambled or hard boiled egg to eat.

 

[courtneyripp]

Unfortunately whenever I try to post a picture my device freezes. But I'm feeding them chick starter and occasionally give them a few meal worms. They are all about 2 weeks. Maybe a little older. And she of for sure drinking but I'm not so sure about eating. @Wyorp Rock
My dad was having me take care of a few of his ducks for a couple of days and maybe having them in the brooder had something to do with this?

 

[Wyorp Rock]

The crusty feathers could be from being wet I suppose.
If she seems like she is not growing watch her to see if she if eating. Depending on how many chicks you have in the brooder she may not be getting to the feed?