What should I do about my mother's suffering from the noisy macaw, given my fear that she might curse me, and will her curse afflict me?

What you did by buying the bird, despite your mother's refusal, is impermissible. Your repentance and your offer to get rid of it serve as expiation for that. As for your mother's prayer against you, we do not expect it to harm you, because it is unjust and was uttered in a state of vexation and without intent. Such a prayer will not be answered.