My wife's phone is locked out. She has forgotten her passcode due to memory loss caused by Alzheimer's disease. How do I help her unlock her phone?

The only way to remove the passcode, is to restore the iPhone to factory.

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

Hi

You need to restore iPhone using your pc

Turn iPhone off

Make sure your pc is running the latest iTunes 12.6.2

Connect lead to USB on your pc

Press & hold just the power button down on iPhone don't let go

Connect lead to iPhone keep power button pressed down until pc sees iPhone Then wait for restore you may need to do this more than once Before it works.

Cheers

Brian 🇬-1F1E7;

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support