If you do not see GPS location data on your user control panel https://my.thetruthspy.com, please have references followings:
1. General reasons:
Check with this link for general reasons that make your account does not have the data logs:
2. Location option was not turned on
Although the application can turn on automatically in your child's device, maybe it was turned off again. So these reasons still make no data in GPS Locations data on your user control panel.
If you have a chance, you can do a turn-on. Here can help you how to do:
You can read this article about the target device was not turned on yet with the message "access to my location option turned off":