I have a small flock of three ISA Browns. One of my hens, Gertie, hasn't laid since early March, and has been having light diarrhea for about a month now. I've been keeping an eye on her and have separated her from my other two girls a few times (they are fine health-wise). I lost two hens during the winter suddenly (I'm still not sure why, it was a mild winter and I just got them as chicks last March) so I thought maybe I just got some very susceptible birds. Throughout this week I've noticed Gertie getting weaker, and limping. Tonight I found her on her side on the floor of the coop. I brought her in, soaked her for about a half hour, then put her in quarantine in my dining room in a large plastic tote. I went back to clean out the tub she'd been soaking in and noticed worms! So I began researching and thought she might have roundworms. So I went out and bought some Wazine. I started her on that. But then I found an article on flystrike and those maggots looked more like what I'd seen in the tub. So I flipped her over and there is this nasty hole in her flesh to the side of her vent crawling with maggots! I used tweezers and peroxide to get rid of all I could see and to cleanse the wound. I slathered it with triple antibiotic ointment. I'm honestly not sure she'll last the night. But if she does, what should my course of action be going forward? Any products to recommend or procedures to follow? I've kept chickens for about six years and never had anything like this come up. Until these ISA Browns, I've never lost anyone to anything but old age . Any help or thoughts would be appreciated!