My friend lost her iPhone and don’t have another apple device

If she had Find My enabled on the phone, she can try to track it by logging into the iCloud Web interface with her Apple ID and password and using Find My.

https://www.icloud.com/

If she doesn’t have another Apple device she needs to use https://icloud.com/find

(appending the “/find” keeps her from needing a 6-digit 2FA Verification Code)