My friend and I have been playing in a world for months now.  Last night when she joined, she was sent directly to spawn with her inventory and armor missing.  Essentially, the game is treating her as if she's never joined the world before.  All of her pets don't respond to her and her ender chest is empty.  This world is a local world (not a realm) that she joins through an invite on the friends list. We have no idea why this suddenly happened or how to fix it.