A grey is not a pet that you can pat on the head and it will looke up and love you for ever. They go way past that. You have to earn the trust of a grey and it does not happen in a week. It could take a month or 6 months or evean a year. But when you gain the trust of a grey you have it for ever. It takes time, and kindness on your part.
Also the family has to be apart of this with every one doing there part so all can be sean as a flock
Sit by the cage and talk to her sing to her offer her treats read to her and the rest of the family too so when anyone comes around she knows something good is going to happen.
You will get alot of good advice from the members on this forum. A week seams to short to me for you to decide and you could miss out on something good
Good luck