She should move into tomorrow. Normally when I TT they move in the next day. But sometimes it's 2 days. I would bet on two days since her plot will go up tomorrow.
I have her up in the thread now since it seems you're not online. But if come online soon enough just know she's not original! Like, at all. I know that bothers a lot of people.
I normally try to hold villagers if I know someone is gonna pick them up. The only time I don't really hold them for a specific person is if they're not online when they go into boxes and someone else wants them. So if you wanna buy the other cookie totally fine. C: