well yes she may have mites,
of which you should have seen them crawling on the body.
But using the mite spray in the cleaned out nest boxes and replacing bedding and adding the diatomacious Earth in the bedding of the nest boxes.
As for the hen
I would by some BLUE KOTE and spray the sore area of the spot where the sore is
.DO NOT SPRAY DIRECTLY ON THE VENT JUST SPRAY ON THE EFFECTED REDDENED FLESH
which the bottle of BLUE KOTE will tell you if you spray more than once.
HERE IS THE INFORMATION ON USING BLUE KOTE
Dr. Naylor Blu-Kote Indications
For the effective treatment of fungal infections, surface wounds, cuts, galls, hoof-foot and pad sores, chafes, abrasions, moist lesions, itchy fungus eczema and sores on horses and dogs.
BLU-KOTE® is a germicidal, fungicidal wound dressing and healing aid effective against both bacterial and fungal infections most common in skin lesions of domestic animals. Kills ringworm. Helps to dry up blisters and pox-like sores or lesions.
Dosage and Administration
Clean and dry the affected area thoroughly before spraying. Scrub and remove the scale and scab on ringworm before the first application. Shake well. Remove the protective cap. Hold upright. Point the nozzle opening toward the lesion and spray from a distance of 4-8 inches. Only a light application is needed. Repeat once or twice a day or as indicated until healing occurs.
Precaution(s): Danger: Extremely flammable (aerosol package).
The contents are under pressure. Do not puncture. Do not store or use near heat or an open flame. Exposure to temperatures above 130°F may cause bursting. Never throw the container into a fire or incinerator. BLU-KOTE® stains clothing.
Caution(s): For external veterinary use only. In case of serious burns, deep or puncture wounds, or if redness, irritation or swelling persists or increases, discontinue use and consult a veterinarian. Keep away from the eyes, mouth, nostrils, and mucous membranes. Do not spray in the eyes. Do not inhale. Do not use on cats. Prevent dogs from licking the treated area.