How can I prevent my child from bypassing Screen Time limits by changing region or restarting the device on iOS 18?

I’m having recurring issues with Screen Time on my daughter’s iPhone (running iOS 18), and I would appreciate any help in closing the loopholes she’s found. She has discovered two reliable ways to bypass the daily Screen Time limits I’ve set up: 1. Changing the region of the device — When she switches to another region in Settings > General > Language & Region, the Screen Time usage stats and limits appear to reset or be disabled temporarily. This effectively gives her a fresh start on screen time. 2. Restarting the iPhone — After restarting the device, Screen Time limits stop working for the rest of the day. It’s as if the usage clock or restrictions aren’t reapplying until the next day, or perhaps not at all. I’ve already taken the following steps: - Set up Screen Time using Family Sharing, with a passcode only I know. - Enabled “Block at End of Limit” for all apps I want restricted. - Turned on “Set Automatically” under Date & Time and tried to restrict changes via Content & Privacy Restrictions — though I can’t find a way to lock region or fully restrict this setting in iOS 18. - The phone is up to date and not jailbroken. Questions: * Is there a way to lock or restrict region changes on an iPhone? * Has anyone found a workaround to prevent Screen Time from breaking after a reboot? * Is there a more robust way (via MDM, profiles, etc.) to prevent these loopholes from being exploited?