Well her cage size should be upgraded to a 4x2x2, When you say she is fully grown, How old is she? And the puffing out her beard in the mornings or after a sleep would mean shes stretching it. But ifs shes also bobbing her head quite slowly, That means its more like domination, and trying to be bigger. Abit hormonal aswell. Are you sure shes female?

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You either love me or hate me, Abit like marmite...