Anything would help
Thanks from a worried bird momma
Welcome to BYC. It looks like she has been severely vent pecked. She could have had a prolapse or not, of the internal part of the cloaca or vent. The red will attract pecking, but she may have just been pecked by more aggressive flockmates. Once they see any red, they will all join in. I would being her inside and do daily warm epsom salt or saline baths just to her vent area. Then apply some Vetericyn spray or plain Neosporin ointment. Make sure no flies get near her, or she may get fly strike. Check to make sure there are no maggots in there now. Let us know how she is doing in a day or so.