I'm getting married in a few weeks, so my wife's last name will be changing. Consequently, she'd like to change her email address and iCloud username from her current last name to my last name. We've created a new iCloud account for her. Now, since her contacts and things are stored on the phone as well as in the cloud, we know that those will be uploaded into her new iCloud when we switch the account on her phone. However, some apps use documents in the cloud for storage. Are any of those documents stored on her phone? For instance, when she switches her iCloud ID over, will she lose her progress on Tiny Wings? Her files in Pages? Any help or advice is appreciated. Thanks.