She wonders if he thinks of his last day before Baedal as the day that he died again or the last day that he was married to Daisy; Ivan's wife is still a vague and abstract concept to her, and the further away they get from her, the less she's inclined to be worried or threatened by it. He's allowed (how generous of her) to have cared about other people before he knew she existed, that's all right. As long as she's most important now, and she questions that less and less.

(Not 'not at all', but- less.)

If she were older, she supposes, she might recount something of her own in return, but- she'd been a child before Prometheus, and the passage of time in captivity was blurry and painful. He knows, at least in the broad strokes, about most of the days since Prometheus, especially since increasingly he's been around for more of them than he hasn't. So instead, she says, “I was very pleased with myself.”