You know what? Sure. I do it all the time. Nothing bad comes of it except roaches and weeds, things that won't affect your game badly. Now, I've travled as far as the game allows, and all that possibly happens is weeds and roaches. Your villagers don't usually leave, well not for me at least when I TT. Every time I play, I usually time travel for like 1 or 2 days. Nothing bad. It's perfectly fine with me, and I think you should let her. Nothing bad will come of it, and you can reset your time back to normal.