Girlfriend can not join my Minecraft worlds!

The summary pretty much says it. Ever since I got my new Xbox, I would start a world, but for my girlfriend whom I play often with, she tells me that I am offline. We found out that when I am playing in worlds that I have, it always shows "Your friends are not playing Minecraft right now." This has been going on for about a month now. Multiplayer is turned on for all my worlds also. (She can still play with me on dedicated servers like The Hive and Mineplex.)