Jemma’s relieved by the laughter. It sounds genuine rather than derisive.

Reaching out to take Freya’s hand, “Jemma Si— you already know that.” She shrugs a little. “Do you have some time to talk? I would really like to know what’s going on. The Doctor mentioned something about vampires, and witches, well, you.” She’s about to hit Jemma babble-mode if not stopped.