Q: How do I add my daughter on my find my iPhone

If your daughter uses a different Apple ID as you, then go with your PC or Mac to www.icloud.com and enter her account informations (User Id, passwort). When you use the iPhone App "Find my iPhone" simply logout and enter her Apple ID.

Attention:

Your daughter must have activated the feature find my iPhone. Simply go to settings -> iCloud -> and activate  find my iPhone.  ( http://www.apple.com/support/icloud/find-my-device/ )

Hope i could help

Greetings from Germany