Hi again Afenismom,
Another thought--you purchased Afeni from a pet store, do you know how long she was living there, if she was hand-raised, and if there were other birds near her?
If she was not adequately handled by people at the store and spent much of her early life there, she may have learned to associate more with other birds than with humans. This would be all the more reason why you should put both birds in the same room.
Does Afeni contact call when separated from Phoenix? Does she prefer to be more with Phoenix or with "her human".
Regarding the squabble over perch real estate, I think that's just normal bird behaviour. From your description of their time together, they seem to be turning into real buddies. Could it be that Afeni is upset at, from her perspective, being inexplicably separated from her friend?