I’ve always used blue kote and liquid bandage. Keep her hydrated (chik’n aid is good) and try to get her to eat (maybe she will eat some scrambled eggs?).
It’s not a space issue it’s a numbers and breed issue. You have two dominant breed hens with a single submissive hen. You need to add hen or two, or you need to break up the gang. I have the same omlet I had 3 big fat barred rocks and 2 Ee in it together they didn’t have space issues but I...
I get the whole “rule of thumb” someone made up but I have that exact coop and I had 3 barred rocks and 2 barn mix EE in mine with no space issues. During winter they all pile into the nesting box together. I’ve actually noticed the different breeds click up which I think is her issue.