How can I disable "in game" chats on iOS 8?

I

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I have restrictions set on my daughters iPod touch 5th Gen (IOS 8.1.1 or 8.1.2). When I set the restrictions, I disabled game center, but somehow she is still able add friends & access the chat features on games purchased in the app store. I thought with restricting game center, you could not add friends or chat on games? (example: trivia crack)
How can I disable the add friends & chat features?
Thanks
 

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