For sure a RIR rhode island red hen. Tough birds, not the friendliest or the best mothers JMHO.
Will do ok in cold climates but if I were looking for friends for her I'd look for a more cold hardy breed with a smaller comb, they can get frost bit.
I would place an ad in CL looking to adopt older hens first. Many people would be willing to give up an older non laying hen for a pet. If you want egg layers get a few more RIRs or another cold hardy breed and raise some chicks. Raise them separate then perch them together at night.
Remember that laying pellets are poisonous to horses, don't let the horses get into her dish. I bet your lovely "lost girl" is a no longer laying hen turned loose or just got lost/run off. Kitchen scraps are good but like said onions are yucky and bananas and their peels are poisonous.
Birds are pretty low maintenance when left to their own devices, it's when people coop them up too much in dirty pens that they get parasites and diseases. So no worries on the vet if you let her roam!
Thanks for taking her in!! What a sweet girl!!
ETA: does "she" have many black tail feathers? "Her" comb looks a tad large... You'll know soon enough when it gets older/comfortable and starts crowing! Could be a very young rooster that got ran off by an older one... In that case I might be trying to find it a home.
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