In general...flies lay eggs somewhere easy, if she had runny poo or some stuck on her, they could've collected there, where they normally would've been groomed off. They hatched, and found something they liked. They do not eat live flesh. She could've had a small wound or something, but if maggots are all removed, it can easily heal and she will do fine. If shes acting fine, I doubt she is egg bound. Im relatively new to chickens as well...ive learned they are as intense or laid back as you make them. If you don't pay attention, they either make it or not, or if you pay close attention, you notice every little thing and that can go either way. I find myself making a big deal over little things, or ignoring things that maybe I could've fixed. Its all a learning process.
My humble advice would be to check carefully under feathers, armpits, etc and make sure maggots are gone. If they are, then carry on as usual. If she acts strange, you do what you can, either you spend the $60 and use that time with the vet to learn everything you can about any common disease and home remedies to save you from going again, or you let her tough it out. I am learning more and more everyday. I am fortunate that I work with vets and one has some chicken experience so I can get some free advice here and there, but I find the advice in the old forums on here to be more helpful honestly. Search on this site for maggots and see what you come up with. can always try some antibiotics and just throw away eggs for 2 weeks if you are worried.
Good luck! keep us updated!
