It is, I thought Whitney was lost, but then her plot just popped up xD Aww well, as long as your friend does not wi-fi with anyone after the time they lost her, you'll have a shot I think c: Yep it would still work as Rosie is in their pool of villagers because she recently moved out c: It doesn't matter of you were there before so as long as you have a space, hopefully she'll move in!
Good luck! I hope you get her! C: I can help you when I reset if it doesn't work :3