By the way, the Otoshiyori to shogun's wife did her job not in the 'Chidorino-ma' room but in 'Rojoshu-tsumesho' (literally, the room for female servants) near to the wife's residence.
ちなみに御台所付御年寄は「千鳥之間」ではなく、御台所住居近くにある「老女衆詰所」に詰めていた。