After "Number One" of course.
her? Number One was only ever addressed as "Lieutenant", thereby quite possibly falling behind Elizabeth Dehner (who shared braid with people addressed as "Commander" or "Lieutenant Commander").
Of course, both Number One and Dehner only wore the one braid that would later come to identify Lieutenants. But such costuming detail is messy, while the dialogue reference to Number One as a Lieutenant rather than Commander is pretty clear-cut.
...Unless we assume that Pike considered the woman his lieutenant, lowercase l, irrespective of her rank.