Hi Kelly,
I understand you want to stop your daughter from switching to a neighbor’s WiFi.
Do you have any control through the school IT team or Microsoft Family Safety on her account?
Windows 11 does not provide a built in feature for standard users to block or hide specific WiFi networks. Network control at this level requires administrator access or device management. Since the laptop is school managed, the supported path is through the organization that controls the device. I would recommend to ask the school IT team to apply a policy using Microsoft Intune or Group Policy to restrict WiFi connections to approved networks only.