How do I locate one of my devices
How do I find the location of my daughter phone
iPhone 7 Plus
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Did you use your Apple ID to set it up?
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Locate a family member’s or friend’s device
If you’re part of a Family Sharing group, you can use Find My iPhone on iCloud.com to help locate any family member’s device. Their devices appear below yours in the Devices list.
Each family member must set up their devices to share their locations with other family members. See the Apple Support article Share your location with your family. Once they set up location sharing, you can locate their devices using the instructions above.
You can’t add a friend’s device to Find My iPhone. Friends who lose a device can go to icloud.com/find and sign in with their Apple ID.
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copied from: Locate a device in Find My iPhone on iCloud.com - Apple Support