Female pearl cocktiel has been aggressive since yesterday morning. I found that she has infujured my male cockatiel so i separated them, today when i put them back she chases him around when he goes near the nesting box. Since yesterday she gets all puffed up and territorial and tries to bite, she rock back and forth a little, i thought it was egg binding, when i attempted to put her under a warm towel she got out of the nesting box and was perfectly fine, personality and all, just when she gets in the nesting box. her vent wasn’t swollen and i felt underneath and it didn’t feel hard or anything like an egg was there, it was quite soft. so after that he was k last night and i separated the two birds. This morning she was in the box again, hissing and still trying to bite the male when i put him inside. Help?