Chicken with worms

[CountryWomanFarms]

So a few days ago I noticed one of my chickens seemed a bit off but I chalked it up to it being an unusually hot day. But tonight when I went to close up the coop she was laying on the ground not moving so I checked her out and she couldn’t stand, had some poop stuck to her butt, and felt a bit thin. I figured she was egg bound and I stuck her in a bucket of warm water and epsom salts. When I went back to check on her about 15 minutes later there were what seemed like hundreds to thousands of little brown worms, about a centimeter or less in length, crawling up the side of the bucket and in the water.
After I panicked a little I got some rubber gloves on and rinsed her and stuck her in a cardboard box in my shed for the night. Now I need to know what type of worms these are and what dewormer to get. I have a flock of nine hens including the wormy one and four 8-10 week old chicks that are in a separate enclosure but have had contact with the other chickens.
The pic isn’t the best but it was dark and my phone was acting up. Any help identifying the worms and the correct dewormer would be appreciated.

 

[nuthatched]

Those look like maggots. Check her for wounds. Hopefully, they were just in the poop.

 

[BigBlueHen53]

Aren't maggots white?

 

[BigBlueHen53]

Are they coming out of her vent, or off of her feathers?

 

[dawg53]

Poultry worms are white in color(except gapeworms) and cannot survive outside the host. They are not worms in the photo. They appear to be small maggots as @nuthatched mentioned.
Unfortunately the hen has Fly Strike.