my daughter phone is saying unavailable

The wrong passcode has been entered enough times that the phone is now locked.

If the screen tells of a lockout time, you can wait and carefully try again with the correct passcode then.

Otherwise the device will need to be erased and reinstalled as new.

If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support

If you enter the wrong passcode on your iPhone Lock Screen too many times, an alert lets you know that your iPhone is disabled. (Learn what to do if you see "[Device] unavailable" or "Security Lockout" on your iPhone or iPad.)

Lock Screen Passcode or Screen Time Passcode.

Following this process is the only way out if your iPhone is disabled. The steps given in this link will help you reset the passcode -> If you forgot the passcode for your iPhone, iPad, or iPod touch, or your ...

Note: If you have forgotten the Screen Time Passcode then restoring your device from a backup after the passcode reset will return the Passcode back to your device. So, please do not restore from a backup.