Please take a moment to read our agenda.http://www.mytoos.com/forum/ubbthreads.php?ubb=showflat&Number=126292#Post126292
She's still a baby and needs to know that her flock is still close by. Cockatoos stay with the parents for a year or more and need to know they are close. Use the search and look up contact calls and screaming, there's a ton of info. A contact call can be something simple like a noise or word that you use to let her know that you haven't left. If she is able to say any words or make any small noises that's a good place to start. The yelling at bedtime is normal cockatoo behavior. Get ready it will get louder as she gets older. Toos will generally display and call twice a day for as little as a few minutes to up to an hour. A goffins display isn't too bad although can hurt the eardrums if too close. During the night you may want to try a night light so that she doesn't get frightened when she hears noises. Is her cage in a quiet area with no lights, tv, radio or people walking past while she's trying to sleep? Toos require 10 -12 hours of undisturbed sleep per night. Many people use sleep cages at night put in a room with no activity around. The sleep is very important to them. As your too gets older and you get to know her well you'll see the difference in behavior just like a child who goes to bed too late they can get very cranky.
There are some excellent articles on the main page, worth taking the time to read.http://www.mytoos.com/main.shtml
Have you had large birds before or worked at a rescue with them? I'm assuming that a bird at only 7 months was a purchase. Many here have done the same thing. You get caught up in the cute and cuddly bird and are told what a wonderful pet they make only to find out down the road what they are truely like. This is not a pet that can be left in a cage for long hours with no play time or social interaction. She is going to have to be taught everything. How to play with toys, what to eat and a slew of other things. You will have to change your lifestyle. It's like having a new baby in the house her needs come first. No more spur of the moment trips, plans need to be made to go out for dinner and a movie, meals need to be prepared, cages cleaned, and lots of money spent on toys, food and vet bills. Have you made an appointment with a certified avian vet yet? This is crucial. They need to see an avian vet annually. The first appointment is the most important. Blood work and test will be done to be sure she is healthy and not carrying any hidden illness. Others will come on with more info.
If you don't have the time for her or realize that you have gotten in over your head you may want to consider returning her to the breeder or pet store. So many of these incredible intelligent birds end up being put in a basement or garage because of the noise and mess or worse get bounced from home to home. This is when you begin seeing psychological behaviors of plucking, mutilating and aggressive biting. And then again you may see these behaviors in a bird that has a stable loving home also. If you choose to keep her get ready for a rough ride. Yes you will get bitten. G2s have a smaller beak but can still deliver a dangerous bite. Toos and children don't mix. Kids move to quick and sudden and make toos nervous. A bite from even a little too can blind or disfigure a child. Take the next few days to do alot and I mean alot of reading to see what you've gotten youself into and use the search feature to look up biting, plucking, mutilating,bathing,diet, etc..