She could be swollen from something else going one in her abdomen that could have something to do with internal laying or egg yolk peritonitis, but it might be from this flystrike problem if they have eaten through the skin. It sometimes takes 2 or 3 baths to make sure the maggots are gone, and I would look carefully perhaps with a magnifying glass or reading glasses.
Do you have any antibiotics? Does she still lay eggs? Many people don’t like to use antibiotics if at all possible, and if you do, there will be a long egg withdrawal. Hopefully, the baths and ointment will help to clear up the infection.
Make sure that she continues to eat well. You may want to treat for flies in the coop with something like permethrin which is safe for chickens. Good luck, and let us know how she is doing. More pictures of her progress could be helpful to others.