Hello Kevin and welcome to our family, I think you stated that correctly, you have been taken over by a grey for they seem to be the ones who own us and not the other way around.
I am so glad you could open your heart to give this grey a new forever home for it seems she needed it so badly, I am sure they loved her but maybe they just didn't know the needs of a grey, that they need attention along with the love and care, in any case she is getting it now and is blossoming under your care.
Since you are more familiar with smaller birds do read thru the threads here for lots of useful information and do ask those questions you have and we will help you in any way we can.
If you have any pictures of Seuss you would share with us we would love to see her.