Hello Jocko and welcome to our family, so glad to hear you could give Jocko a new forever home, poor thing being passed around to several families before coming to you but if this is her final home then you can start working on a lasting relationship with her.
It would help to know her background if you know it and if you are willing to share how you came to acquire her then by all means share it with us, it will assist us in being able to help you with her.
She needs time to settle in and feel comfortable, she is an older mature bird so she is set in her ways but it will take time and lots of patience to build a trust with her for she may feel like this is just another stop in her journey to yet another home. Just give her lots of space and time and do not try to rush her into anything she doesn't want to do right now, let her make her own decisions about coming out of her cage and interacting with you.
Be sure to browse thru the many threads here for loads of useful information from firsthand grey owners, many of us have been thru what you are going thru now and experience is the best knowledge in many cases.
Feel free to share some pics with us of Jocko as we would love to see them.