How can I find or tell if a hidden GPS/spyware tracking app has been installe...
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1.Go to Settings > Privacy > Location Services and you can see what apps have location services enabled.
2. If you're using the Messages app for texts I wouldn't be concerned that she has installed any software to track you.
3. Open Find Friends and make sure you aren't sharing your location with her.
4. Open Settings > Messages and look under text message forwarding. Make sure there aren't any unknown devices listed.
5. Change your Apple ID password at
http://appleid.apple.com if you think she may know it.
6. If you're really worried, go to Settings > General > Reset > Reset All Content and Settings and set your phone back to factory defaults. Set it up as a new device.
Keep in mind iOS is a pretty closed ecosystem. If there was spyware installed on your device you'd probably be able to see it.
Are you sure you're running 7.1.1? iPhone 6 came loaded with iOS 8. Why haven't your upgraded?