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Unless you have quarantined her yet she needs to stay OUT. If she hasn't been quarantined then she could pass on diseases to the rest of your flock.
I second. I assume she's been exposed to your flock already, so honestly if she has anything the others should get it too. All new birds should be quarantined for at LEAST 2 weeks before being put with other, healthy, chickens. Especially your own flock. Mites are running around all over the place this time of year looking for warm hosts to live off of. That's only one element that needs prevention.
As for fighting, that is the pecking order. Your flock is now in chaos because there is a newcomer who has no place in the society and has distrupted the peace. I've never had any new bird who didn't have to go through some sort of bullying-that is just the chickens' way. Fighting is completely normal. If you put her back and she draws blood you must take her away ASAP until she heals, or else you could be inviting several new problems.
As for spurs, hens and roosters can both have them. 'Real' spurs found on hens are commonly found on gamehens especially. Although I've even owned a Polish who could pack a punch with hers. I never go by spurs when sexing fowl because alot of the time it tends to be based on individual growth. Roosters can get them as late as 2 years. No accurate for aging. But the bird in question is a hen.
