Hello and welcome to BYC, You found an Amazing Poultry Community to be a part of with many great knowledgeable members, who are more then willing to jump in and help you along your journey with any questions you may have.
Welcome to BYC!
Introducing a single chicken to an established flock is rough. Be sure to use plenty (around 2 weeks) of "see-don't touch" time to Introduce her. I hope it goes well.
Best of luck to you and the flock!