Probably because the inclusion of "daughter" as an option is relevant to recent lore revelations about The Doctor and Kalt'sit's relationship as of the Lonetrail event, which revealed that she was created as an assistant to him and originally named by him, with her original designation being AMA-10.
Friends, Romans, countrymen, lend me your ears; I come to bury Miku, not to praise her. The evil that girls do lives after them; The good is oft interred with their bones; So let it be with Miku. The noble Teto Hath told you Miku was ambitious: If it were so, it was a grievous fault, And grievously hath Miku answer'd it. Here, under leave of Teto and the rest-- For Teto is an honourable girl; So are they all, all honourable girls--
