Treat her like a new flock member. Provide a space in the coop for her to live where the others can see her but not get to her.
In my opinion, it's always best to introduce more than one bird to a flock if you're going to add. Perhaps after she has been there for a week or so, get the lowest flock member and add that one in with her. After they are getting on well, perhaps grab the new lowest flock member to add to the group. Once they are getting on well, perhaps then you can let them in with the rest of the flock.
OK I will give it a try.. Thank you.