Have you had any respiratory illness in your flock?
The lesion on the leg is concerning. It's possible it could be from injury, but since there is also a tumor/abcess under the wing, I suspect they are related. Two diseases that I know of off hand that would cause a skin lesion on the leg like that are Mycoplasma synoviae or Marek's.
If you haven't done so, separate her and add poultry vitamins to her water. Look for one that has Vitamin E, B2 and Selinium. These won't cure, but can possibly give her a boost. Either illness is contagious, so practicing bio-security is paramount.
I suggest, if you can to take a swab and send it to your state lab or an independent lab like Zoologix for testing. They should be able to make a confirmation if it is Mycoplasma. (I believe for Marek's a necropsy has to be performed).
While neither one is curable, Mycoplasma can somewhat be treated with Denagard. It's possible she may make a recovery, but the leg lesion looks like it may be infected at this point. Mycoplasma will make her a carrier for life and any chickens exposed to her would be considered carriers as well.
Depending on what your chicken keeping goals are (selling/giving away hatching eggs, chicks, started pullets, etc.) it may be best to cull her. If you feel like you want to keep/treat her, then you need to find out for sure what you are dealing with and keep a closed flock if the results come back positive for a disease.
I pulled some info that I have, but please do some research and reading. If at all possible I would have her tested.
Just my thoughts.
http://www.merckvetmanual.com/mvm/p...synovitis.html?qt=Mycoplasma synoviae &alt=sh
https://www.backyardchickens.com/t/868525/sores-on-knees-of-3months-old-cockeral
This one turned out to be Mycoplasma:
https://www.backyardchickens.com/t/1075541/can-bumblefoot-start-at-the-hock
Same person - just documented journey a bit more here, ended up later on having other flock members become ill with MS/MG
https://www.backyardchickens.com/t/1077113/seven-week-old-chick-with-a-new-crooked-leg
Marek's
https://www.backyardchickens.com/a/the-great-big-giant-mareks-disease-faq
Skin lesions of Marek's
http://www.poultrydisease.ir/Atlases/avian-atlas/search/lesion/634.html