Permanently remove app from phone and store

How do I remove an app I have authorized from downloading from the app store?

I am sanitizing my daughter's iphone 6 and want to prevent her from downloading previously authorized apps. She can download any previously authorized app from the app store without having to enter the password (only I have).

Background. We would like to restrict the apps which do not help with doing well in school or socializing inappropriately. For example Snapchat is designed to send dic$ pics and Meetme is a pedophile app. I would like to reset these in the app store so they need the password to download.