I think you answered yourself why she calls for you: she's been through many transitions and you've been spoiling her. It's normal for them to call for the flock when alone, and it's probably worse if she's afraid you won't come back each time. And, it sounds like you may sometimes be rewarding her screaming by coming back to get her when she screams.

Best thing to do is to try not to react to the screams. Wait until she's quiet or makes a more pleasant sound before going over to her and praising her. They do learn to be quiet or make more pleasant flock calls this way... though it may take awhile if she thinks of screaming as a way to get attention now. If she just won't quiet down, then go back into the room she is, but ignore her completely and don't look at her until she's quiet.
Another thing to try is, if possible, sometimes take her along with you into the other room to help her realize you aren't going far away.

Karen
Chico (conure) and Pippin (budgie)
WI

My GCC likes to do that ear thing too. I think it's generally if they see dirt, they will attempt to clean it (And the ear is the dirtiest part they're near). Birds preen each other a lot, so if they basically see you as the other 'bird' they will try to preen you.

It's a good sign that she is bonding well with you, though be careful as I think ear wax can be bad for the bird if she gets enough to eat by accident.