Hey Guys! I don't know if any of you had the same problem as me, but if you already spent the 50,000/75,000 Bells, and still aren't seeing GracieGrace, then this is for you.
Amiibo 307 Gracie


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!