Oh girls can fight, especialy when new hens are put in, I use salt water to bath/clean just a teaspoon of salt in half a cup of hot water to dissolve it and bath with cotten wool balls. With eyes use a new cotten ball for each eye and clean from beak end of eye outwards.
Some I know use a cold used teabag on the eyes havent tried it myself but ment to take swelling down. Anything more than a couple of days for the eyes its vets for antibiotics.
Cuts on the comb etc I just clean with salt water and dry with cotten wool ball and put some vicks vapour rub ( or similar stuff) It helps the healing and if a hen pecks at it the taste put them off pecking at it again.
A hen only needs treating for a couple of days with the vicks ( not near the eyes) hope this helps