I wouldn't be overly worried at this stage. But I would be offering 2 snacks a day as well as 3 meals. Offer them at regular times, not just when she's already hungry for boob, cos food is slower and harder to get satisfaction from, so if she's starving, she won't have the patience for food.

And try to eat your meals and snacks with her, and if possible, eat the same foods, even sharing a plate.