In your situation I would not worry about quarantine. It hurts to say that but I think you have other considerations.
I would immediately put them across wire from her. House them in a look but don't touch situation starting now. That could be in the coop or in the run as long as it is predator safe and you are OK with weather. Just having them nearby may calm her tremendously.
That coop is pretty small for integration but you can just turn them loose immediately when you can observe. It could work, especially if the run is available. "This" might possibly happen, that "can" happen, but what counts is what does happen. I think you need to make your decisions based on what you see, not from worry about what you might see. You might see something bad so have a plan, you might need it, but I'd probably give it a try.