Thanks Line! I had read Henry’s affection began in her partiality as “dreadfully derogatory of an heroine’s dignity” because he did not fall madly in love with her from across the room due to her extraordinary beauty. I had not considered that the gratitude situation was backwards but Catherine did start down this road just after meeting him:

Whether she thought of him so much, while she drank her warm wine and water, and prepared herself for bed, as to dream of him when there, cannot be ascertained; but I hope it was no more than in a slight slumber, or a morning doze at most; for if it be true, as a celebrated writer has maintained, that no young lady can be justified in falling in love before the gentleman’s love is declared, it must be very improper that a young lady should dream of a gentleman before the gentleman is first known to have dreamt of her. (Ch. 3)

I guess if Catherine dreamed of Henry that first night after meeting him it was prescience. Here is gratitude in action:

Catherine, meanwhile, undisturbed by presentiments of such an evil, or of any evil at all, except that of having but a short set to dance down, enjoyed her usual happiness with Henry Tilney, listening with sparkling eyes to everything he said; and, in finding him irresistible, becoming so herself. (Ch. 16)