Well, after all it was Dionysus. She shouldn't have been at all surprised at his announcement. Really, she was mostly upset on Harm's behalf. Then Tyr actually showed up. Oh dear. Lottie just didn't think his sense of humor was going to mesh well with Dio's.
Her own date, however...
Lottie turned around, looking as though she was simply hugging Vidar. Truthfully, though, she'd buried her face in his chest to prevent the others from seeing just how terribly amused she was at the growled "arrr." Her shoulders, her entire torso, shook with the suppressed laughter as she clung to Vidar.