Maggots Ate A Hole In Her Backside! Help!

[Lavender18]

This is my hen, Honeycup, she is a White Leghorn/Amberlink... I'm not sure which one... and she's 4 years old. A while ago, (maybe a month or so) I noticed that her comb was floppy and laid on her head weird. Soon after that she got really lethargic, and wouldn't eat. She also had a florescent green poop. after a few days of standing in the exact same place and not eating, I figured I had to do something, so I took her out of the coop, and dipped her beak into some yogurt. She opened and closed her beak, but not trying to eat, just out of wanting to get the yogurt off. Within the next week, I had coaxed her to start eating yogurt on her own. I would say that she ate about 2 teaspoons a day and that's all she would eat for the next 24 hours or so. This is when I noticed that her comb was getting paler and paler by the day. But, soon she started eating and drinking fine, (although she had already been drinking a TON throughout all of this, when she wouldn't eat, so I wasn't worried about that at all) and she was walking around more. My only concern was that she still had florescent green poop. But within the next few days she was pretty much back to normal, (All except for her poop and her pale comb) and that's when I started to relax and realize she was gonna be fine. When I went out the next day to check on my hens, she was standing in the nesting box with her head to the corner, and she had a brownish, reddish liquid all over her backside's feathers, and she smelled like a wet dog. I now think that the reddish part of the liquid might have been blood. I lifted her tail feathers to look at her vent, and she had SO. MANY. MAGGOTS. all around her vent. It was so disgusting. I ran inside to look up what to do, and the website said to give her a bath, and then put Vaseline to suffocate the maggots. I have her a bath, just up to her vent, which resulted in a murky, brownish-reddish water, and then I applied the Vaseline. The next day I went to go check on her and she itched her vent area with her beak, and LIVE maggots literally poured off of her... it was NASTY. I thought that the Vaseline would've killed the maggots...? She still had a few maggots the next day, so I applied more Vaseline. The following day she had no maggots that I could see, but she had a hole that was just a line that dragged from the right part of her vent to like an inch to the right. I'm afraid that's gonna get infected. The other thing is the top half of her vent was VERY SWOLLEN and bright red... She is just standing around right now, she is eating well, and drinking well, but she wants to sleep CONSTANTLY. What should I do to keep the hole by her vent from getting infected? How can I help her pale comb? how can I prevent maggots from further infesting my flock? How can I fix her lethargy? Any help would be greatly appreciated...

(The pictures below are of Honeycup and her poop is one of the pictures too. It seems SO MUCH less green than it was a bit ago.)

 

[Eggcessive]

Maggot infestation or flystrike as it is called can invade any wound or area where droppings have collected in warm weather. It can be deadly if the maggots are internal. Permethrin spray and SWAT gel can kill maggots on contact. Daily or more soaking in warm Epsom salts and spraying the wound with chlorhexidene or Vetericyn to disinfect it twice a day are helpful. It is good that she is eating, and I hope that you can save her. Treat flies in coop and run with permethrin 10 spray mixed in water in spray bottle, and fly traps. Keep soiled vents cleaned with soapy water and trim any extra fluff. Here is a good article about flystrike:
https://the-chicken-chick.com/flystrike-in-backyard-chickens-causes/

 

[Lavender18]

Thank you so, so much!

 

[Lavender18]

"It can be deadly if the maggots are internal" How do I know if they are internal?