Asking a villager to move in automatically voids any streetpass or online villagers to appear wether in campsite or from a new town. As for Whitney's plot appearing, I think it won't. Sometimes this happens, where the villager moves out of the original town but not into the new town. It also happens that even though the new villager didn't move in, the game counts it as if it did so the player would have to cycle the 16 villagers in order to be able to obtain that villager again even though they never moved in in the first place. However keep trying, she might just pop up if ur game is just late.