She may not show up if you are using Time Travel, and travelling clumps of days, she will NOT show up. But if you travel day by day, she might just show up every week! But, there is a Trick with it. When you see her, pass the check, save and quit, TT back a day, save and quit, TT forward a day and Gracie will be back for another check. Do this multiple times and you should have the T&T Emporium in no time!