how do I auto forward ALL text messages with an iPad

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I have a 12yr old child who is texting friends with her iPad and its built-in messages app. I want to monitor all this activity. How can I set it up so ALL text messages are automatically forwarded to a designated email of my choice? Google voice allows this great, but all her friends are now using Messages on iPads so she wants to use this app as well. I keep searching, but can't seem to find an easy way to do this.