How to track my wifes iphone?

How do i track my wifes iphone?

Best way would be Apple's find my iPhone app get her account connected to yours and make sure her location services it turned on in her settings.

Icloud.com then login using your iTunes account and use phone locator

Sign up with iCloud on her phone. Know her apple account. Make sure she has location on and some connection to the internet whether it's wifi/3g/4g, etc. Then when she goes go to icloud.com and it'll show a pretty good estimate of where it is.

You need install tracker app on it like mobilespy:
http://www.monitoring-softwares.com/phone-monitoring-software.html
It helps track the gps, sms, calls and more.