Help poorly girl! Tail and wings down!

[nicnacnoo]

She's eating and drinking ! She's a red top bantam and is particularly small. We got 3 together but she is tiny in comparison to the others. I'm a newbie to keeping chickens so not sure I'm missing something. I've not had eggs off any of them yet! I think there about 4-5 month old! I've checked the coop for red mite and although a tiny amount I treated it! Not seen any since! She just looks down in the dumps and stands around! Please any advise would help!!

 

[BoomChickaPop]

Does she have poop on her bum? And have you seen her poop?

 

[nicnacnoo]

Does she have poop on her bum? And have you seen her poop?

Hmmm no I haven't looked at the poop but I will check it out!! To b honest I really am not sure I should look for! Thank u for reply