Sorry Julie - don't know how I missed this, but I can def identify with you!
When we first got Alfie (actually it was when she turned around 6 months) we gave her two names - Alfie for when she was being good, and Sid for when she was being not!! I have to say, for a while she was Sid more than she was Alfie!
Sid has gradually subsided, but Alfie did go through a phase during the summer where she was very aggressive towards me - regularly biting and drawing blood. I followed advice from here to give her a time out every time she did bite hard, and other than that, not react to the bites! Thankfully it knocked it on the head. I have not had a malicious bite from her since, but I cannot put my hands in her cage unless I am offering her to come out. If I open her little feed windows I have to look out for sure cos she'll nail me if she get's the chance. I just see it as her space and respect it.
She is a little hormonal at the minute too, but any bittes lately have been high jinx!
Hopefully Argyle will get passed this phase too! I know it's horrible being bitten hard by a bird you love!