They're located on a hidden folder called AppData on the C: drive of your computer which stores, well appdata, the easiest way to get there is by directly inputing the path on File Explorer, like for example:
If your username on your PC is "Person1" you input
"C:\Users\Person1\AppData\LocalLow\LAGS\Hailey's Adventure" and It'll take you to the folder which stores the save data.