Truly quarantining is nearly impossible in a small set up. And if you don't do quarantine properly, you are just pretending to do it. It is a real risk when you add birds. If you would go into a decline if something happened to your original birds, do not add strange birds.
However, healthy generally looks healthy. If the person you are getting them from, keeps a flock in good conditions, and her flock looks healthy, I think it is a reasonable risk, others do not.
Do NOT EVER take something you feel sorry for. That is asking for a train wreck. I also would not buy birds in an auction or swap. Those birds have been exposed to all sorts of other poultry and highly stressed.
But from an established flock, not too far from you, with birds raised pretty much like yours, really in a way, those birds have been in quarantine away from your flock.
And my husband of 40 years, barely tolerates a week of baby chicks in the garage.
Mrs K