Merchant Fei's true love has changed from the Cosmetic Master in the Southwest of Archosaur, near the Khatru Pup and the Arena entrance, to the one next to the Magic Mirror in north Archosaur. Convenient, perhaps, for Merchant Fei, who stands a mere hundred or so yards away as opposed to across the breadth of the city, but the Magic Mirror is a bit of a problem. Players may well have to use the quest list to activate conversation with Cosmetics Master Illian, as the Magic Mirror is determined to butt in. Lowering the camera to ground level and aiming it at her from the side helps.
The needed herb, Tranquillia, is all over the hillside to the north of Archosaur - the south side of Flag Hill by name.