Hi HaleJP,
Welcome to Apple Support Communities. We understand that you're having an issue with using Google Maps on your child's iPhone. We'd like to help.
The first thing we'd like to know is if this issue only happens with the Google Maps app. If you're not sure, try to open Apple Maps and see if you get the same results. Knowing this can help isolate the issue to the specific app or device wide.
In the meantime, this resource may help if you find that it's isolated to Google Maps: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open - Apple Support
If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open
If an app on your iPhone or iPad doesn't work as expected, try this.
1. Close and reopen the app
Force the app to close. Then open the app to see if it works as expected.
2. Restart your device
Restart your iPhone or restart your iPad. Then open the app to see if it works as expected.
3. Check for updates
To see if updates are available for the app, open the App Store, tap your profile icon, then scroll down to see if updates are available. If updates aren't available for the app, update the software on your iPhone or iPad.
4. Delete the app, then redownload it
Delete the app. When you do this, you might lose data that was stored in the app. Then redownload the app. Then check to see if the problem with the app is fixed.
If those steps don't resolve the issue, let us know.
Cheers!