There should be an option in Animal Crossing for periods when you’re taking a vacation or leaving your 3DS for a few days to give control of the town to Isabelle, thereby preventing villagers from moving out. Think about how cute it would be, just before leaving tell her you’re taking a trip and she’ll have to take over, then when you return she can give you a rundown of what happened while you were away (fishing tourney results, “I heard Rodney’s thinking about moving!” etc) Like a pause mode.