"I just didn't want to put up with it, they have their chances to have fun, and sometimes we need to be serious." She sounded slightly defensive, but it had more to do with the now than explaining her earlier irritation. Putting all the 'off' things together made her sound significantly sick and if there were anything she hated nearly as much as crying, it was being sick. She might deny she was anything but a model patient, but it was denial.
And had that remark about his mother not been humorous, she likely would have choked on the cookie she was in the middle of swallowing. As it was, the humor earned him a soft sound of amusement and a half smile, taking the edge off the defensiveness.
She still didn't really want to answer him out loud, to give that revelation merit with sound, but she did, sighing softly and studying the motion of her thumb as it swept slowly back and forth over his knuckles.
"Ten pounds, maybe," probably, "more, I'm not exactly sure," she admitted quietly, then quickly added, "but it's not thatbig a deal, I've lost more than a few pounds before when I was sick, and I've lost it quickly for stage work." Of course, the former had been when she felt too sick to eat and the latter certainly hadn't involved this much food.