How do you impress Gracie in Animal Crossing?

How do you impress Gracie in Animal Crossing?

There is a requirement you must meet in order for Gracie to visit your town: Your convenience store must be at the third upgrade, the Home Center. To get the Home Center (T.I.Y), you need to have spent 50,000 bells in the shop and waited 21 days since you got the Super T&T, the second upgrade.