Possible egg bound Amerucauna, and had a problem with maggots also

Went to close the door and feed our hens today and one was acting injured lifted her wing and she had a lot of maggots crawling on her, first I thought she might be injured so we isolated her and sprayed fly/ maggot spray on her. We then gave her a bath a while later with baby shampoo and rinsed her with vinegar water rinse( some searching around we had come up with this online). Checked her over to see if she is prolapsed or injured, from the looks of things Im leaning toward egg bound- could feel a hard egg shaped bump back by her thigh and her vent looked swollen but not bleeding. Treated her with red kote( only thing I had available at this time of night to help keep the maggots from reappearing) She seems lethargic and can only walk hobbled, this was our most assertive hens and catching her is usually quite a chore. She hasnt laid in 3-4 days for sure didnt notice right away cause we've had her miss days with no problem before.

Just wondering if the maggots are a sign of internal injury and thats she gonna go septic soon or is there more we can do to help rehab her?
thanks