She doesn't show up until you've had the shop for 4+ weeks.Since she's so random, most people who get her TT to the day after and back again and get all 4 checks done. I've had her 0 times and I've had the shop about 3 weeks. It's just luck.
She doesn't show up until you've had the shop for 4+ weeks.
She's not completely random, you have to meet certain conditions for her to have the chance to show up. I mentioned the conditions before, have the TIY/Home Center shop for 30 days/1 month, and you have to spend 70k at the shop each time (as in, to do all four checks you'll need to spend at least 280k total) before the game will roll for the chance to get Gracie. It's still merely a chance for Gracie, but your chances are 0 until you meet these conditions.
I just checked. You only have to spend 70k bells once, and after that it's random. Time doesn't affect it.