So she waits for him, because what else can she do.
She waits, wondering if she'll even see him again. Wondering if he's thinking of her, and doubting that he is. He's trapped there, so far away from her, and he did it knowing full well that he would be.
And still he went, straight into the arms of Madam De Pompadour. Is he holding her hand now, and forgetting that his hand belongs to another?
She feels so cold without him. She needs to feel his hand in hers. Needs him back.
So she waits, because what else can she do?