She isn't bugged, there's no need for her to send a letter because she rescues you. As far as I'm aware, the flirt dialogue is different if you "romanced" her prior to the expansion. It never really went anywhere in SOR, it officially begins in KoTFE at the end of Chapter 9. The romance prior to that during KoTFE's other chapters certainly implies a continuity from before, as I doubt she'd be making out with the main character twice otherwise. (before meeting heskel in chpt. 9, and after being stabbed by arcann later that same chapter.)