[She notices the way he looks at the snitch and explains.] Your Mother made it for you. She used to be here too.

[At his question, she looks away. Her look turns dreamy.] Back home, I'm part of a team. We're called the Teen Titans. One of my teammates, Cyborg, made a special communicator for each of us. It allows us to always remain in contact whatever the mission. And it reminds us that we belong to a team. My team is the only family I ever had.

That's what I gave you: my communicator. [Because it's one of her most precious possessions. And because in case she'd have left before Harry did and other Titans had been brought here, they would have helped him.]