Can someone identify and suggest treatment for this pest?

[my beautiful girls]

Does anyone know what type of pest this is? I have treated my hens with ivermectic, the just had their second dose. I have sprayed with permethrin. cleaned coop twice and sprayed with permethrin, then did whitewash inside the coop. the parasites are still here. especially on my buff orphington. I ordered elector psp. It has not arrived yet. My buff orphington is constantly preening and puffs up when one of the other hens comes near her. She is pulling some fluff feathers out daily. I need help on how to eradicate these pests. We are in California. Thanks in advance.

 

[coach723]

Can't zoom in enough to see the bug clearly. This link has some pictures, close up, that should help you with ID of it, also has treatment instructions and options:
https://the-chicken-chick.com/poultry-lice-and-mites-identification/
Your orphington also sounds like she may be broody, the preening and pulling breast feathers (she's nesting and making her breast better for keeping eggs warm) the puffing up when others come near, all signs of broodiness. Sometimes they screech like a teradactyl protecting their chosen spot. If you are not going to let her hatch eggs, then it's best to break them, they tend to not eat and drink well while broody, so best not to let them stress their bodies if they aren't actually going to raise chicks. To break them (it's not as bad as it sounds) you put them in a wire crate in the run with no solid bottom, no bedding of any kind, raised up on bricks or blocks or boards, so that air can circulate all around them. That helps cool their bodies and discourages the trying to sit on a nest. They have their own food and water and they stay there until they are no longer acting broody. If you let them out and they go right back to nesting, then it wasn't long enough, back to the crate. Sometimes it only takes a day or two, sometimes they are very stubborn and it can take a little longer. Examples of broody breakers below.

 

[my beautiful girls]

Can't zoom in enough to see the bug clearly. This link has some pictures, close up, that should help you with ID of it, also has treatment instructions and options:
https://the-chicken-chick.com/poultry-lice-and-mites-identification/
Your orphington also sounds like she may be broody, the preening and pulling breast feathers (she's nesting and making her breast better for keeping eggs warm) the puffing up when others come near, all signs of broodiness. Sometimes they screech like a teradactyl protecting their chosen spot. If you are not going to let her hatch eggs, then it's best to break them, they tend to not eat and drink well while broody, so best not to let them stress their bodies if they aren't actually going to raise chicks. To break them (it's not as bad as it sounds) you put them in a wire crate in the run with no solid bottom, no bedding of any kind, raised up on bricks or blocks or boards, so that air can circulate all around them. That helps cool their bodies and discourages the trying to sit on a nest. They have their own food and water and they stay there until they are no longer acting broody. If you let them out and they go right back to nesting, then it wasn't long enough, back to the crate. Sometimes it only takes a day or two, sometimes they are very stubborn and it can take a little longer. Examples of broody breakers below.
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View attachment 3503751

thank you for the info on broody treatment. I will keep a close eye on her.