Tnx Pajarita

well I'm neither sure about her age nor her/his gender!
The following urls are a couple of photos from her. Is it possible to detect her age?
http://i59.tinypic.com/idw104.jpghttp://i57.tinypic.com/a2z5k.jpgI don't feed her from pellet cause I couldn't find it in my city. I free-feed her sunflower seed. also feed her other seeds,bean,fruits,vegetables and cooked rice. It seems like she doesn't eat too much. mostly she plays with her food.
also she sleeps from 10 pm to almost 7 am (I'm not sure because she doesn't make even a sound when we are sleeping!)
her cage is located on the coffee table in the middle of living room her sleep place however is in another room, far from noise (but without cover).
she is often out of cage (about 6 hours) over the cage and we are around her talking to her. when we leave the room she calls us & flies to find us. but it is rarely with us in our shoulder(less than 1 hour).
we've cut her wings but she can still fly some how.
she is good with all of family and doesn't have only one chosen human!

Another point that may be important: she started biting from last week when we went to a 2 day trip and took her to my uncle's house. after that when she first saw us, started biting any of us around her!
Pajarita wrote:Well, she is going to go into puberty soon and, if you have been free-feeding protein (especially pellets which have soy in them) and keeping her to a human light schedule, she is, most likely, already going through it and they always get a bit more aggressive during this time so I suggest you re-evaluate your husbandry and see if the diet and light schedule could be part of the problem. And I say 'part of the problem' because, usually, a bird that only bites when you try to make it step up from your shoulder it's a bird that needs to spend more time on its chosen human and is, basically, telling you that when it bites. Do you, by any chance, do this when you are going to put her in cage? GCCs that live by themselves (meaning no mate) need to spend many, many hours on their human. Much more so than other species...
Now, if you could tell us a bit more about her living conditions, we would be able to give you more specific pointers. So, tell us, what does she eat? At what time does she wake up and go to bed? Where is her cage located? Is it covered at night? Is she clipped or fully flighted? How many out-of-cage time does she spend and how many hours on her chosen human?