Please help,

We have a 2 year old female tiel. We have had her from a baby and she is extremely tame. (she is a single bird) Over the past couple of months every time we leave the room she screeches like mad and won't stop until you are back in the room with her. Even covering the cage and turning the lights out doesn't shut her up, it's becoming very annoying as although we spend a lot of time with her we can't be with her every second of the day! If we go out she will screech as we leave and still be screeching when we come back. We are in a flat so it must drive the neighbours mad!

We though of getting her a companion but a little while back when my mum was looking after her we tried putting my mum's bird in with her to see if they would be friends but our tiel didn't like the other bird and preferred to be with the humans! (i think she thinks that she is one).

I love her dearly but she is really starting to do my head in

Any advice would be welcome!!