I think her aggression is due to an accumulation of things that disgruntle her:
- shorter days (less interaction)
- her age (she is 'freshly' sexually mature so she is full of pepper and vinegar!)
- your daughter (jealousy) coming home
- Tanya (jealousy)
When a parrot bonds to a human being, the responsibility we acquire is humongous because, in their minds, we need to live up to their expectations - and the simple truth is that we can't! We can't be there 24/7/365, we can't satisfy them emotional or sexually, we can't belong to them and nobody else, etc. And it's worse with needy species -GCCs been, in my personal opinion, the second worst! So it's a case of the more they love you, the more they will make you suffer because, you see?, this 'lack' she feels is ALL your fault (in her eyes, of course) - you are not a good parrot husband, Navre

. But the good news is that, usually, things do get better as time goes by and they kind of resign themselves to a not so perfect love.