My wife has lost here phone

If a friend's device is missing

You can help finding her device if it's missing and has Find My [device] turned on:

1. Open the Find My app.
2. Choose the Me tab.
3. Select Help a Friend.
4. Have your wife sign in to iCloud with the her Apple ID she used on her missing device.

Axel F.

What to do if your phone is lost or stolen.

If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support