Could you maybe slowly move Amber's stuff (litterbox, bed, food, & such) out of your room? Like move the litterbox a foot closer to out of your room each day?
Since we have four birds here, plus three cats, we keep the birds in my room. And only under strict supervision is when any other pets are allowed around them.
It sounds like one of the only options is to get Amber adjusted to having all of her stuff in a different room.
I hope you find a way to solve this, though I know you won't rehome unless absolutely necessary. =)
Good luck.
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