How to find wife’s iphone

See the "Help find a missing device" section of Share your location with your family - Apple Support or use any internet browser and log into www.icloud.com/find with her Apple ID and password.

Also see the following Apple articles for information about lost or stolen iPhones or iPads: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support and

Use the Find My app to locate a missing device or item - Apple Support