You need to separate her. Borrow one of those large metal dog kennels. I just had one in ICU (large dog kennel) in my family room for almost 2 weeks after a hawk attack. I am still using the Blu-Kote on Snow's last remaining wound and my other chickens don't go after it. I flushed Snow's wounds with an iodine solution, dried gently, and put Blu-Kote on it. I used neosporin in between those flushing treatments. Also, I put antibiotics in Snow's water (but remember, you can't eat the eggs I think...). I know that sounds like overkill... but I also know how much Snow likes her dirt baths!
I know peeps have used that pine tar to keep other chickens from pecking, but I don't know if you can use it on a wound like that. I am concerned that if your girls are all pecking at it... they will continue. I agree with the honey and oats... my girls would gobble that up!
Good luck!
Dawn
OK.... NM... I just read your reply #15! You did go with the Blu-Kote!!! Good! If it doesn't work, then some sort of separation might be needed even if it's just to cage some part of the coop off with some hardware wire for awhile.
Sorry, I jumped in without reading to the bottom. My bad =).