Hello iphonefixinmom,
Thanks for using Apple Support Communities. It's my understanding that your daughter's iPhone XR is stuck with a black screen while using VoiceOver. You've done a great job trying to get this resolved. I'm happy to help.
It's possible Screen Curtain has been enabled with VoiceOver. This feature allows you to turn off the display for added privacy on the device.
"To turn Screen Curtain on or off by gesture:
- Wake your device.
- With three fingers, quickly triple-tap the screen. If the Zoom feature is in use with VoiceOver, tap the screen four times with three fingers.
If you use a bluetooth keyboard with your device, press Control-Option-Shift-S to turn Screen Curtain on or off."
Use Screen Curtain with VoiceOver for your Mac, iPhone, iPad, iPod touch, and Apple Watch
If the issue persists, the remaining steps in the following resources can help:
If your iPhone, iPad, or iPod touch won't turn on or is frozen
If your computer doesn't recognize your iPhone, iPad, or iPod
Have a nice day!