Help me identify this parasite so I can get rid of it.

[Jgale]

I have treated their pullet coop and my little girls with chicken powder. I was assuming it was mites but maybe not. I'm attaching pictures of the worst off girl.

 

[DobieLover]

I have treated their pullet coop and my little girls with chicken powder. I was assuming it was mites but maybe not. I'm attaching pictures of the worst off girl.

I cannot zoom into the pictures you posted.
I cannot see any parasites.
I do see a lot of pin feathers coming in on her.

 

[Folly's place]

Agree, if there are mites or lice, I can't see them either.

 

[cmom]

If your bird does have creepy crawlies, my suggestion would be to get some permethrin spray or concentrate and spray the birds.
Here is a chart made by a BYC member for the different permethrin concentrates. I use the 0.50% ratio.