When you pick up a villager from another person's town, the villager will move into your town the next day. Time traveling forward or backwards still counts as "1 day forward". So unless you're trying to plot reset Maple to a desired part of your town, there's nothing to worry about losing her.
If you time travel to the 11th, pick her up, and immediately time travel back to the 10th (1 day backwards), you will see her plot appear in your town. The only way to lose her is if you invite another villager to live in your town before you have Maple's plot appear in your town.
Also you don't have to specifically time travel to 6am. As long as it's between 6am-5:59am of the next/previous day, it's considered another day. So you can just flick one day ahead and flick one day back when you are ready!
let me know if you have anymore questions
