It's eating her up inside, distracting her from the tournament, filling her with indescribable anger, what the hell are you doing with her?!. It's not that she could claim something from you, it wasn't an official relationship, or even a public one, it was just a passing thing maybe, encounters to relieve stress or just need, not her fault that you kiss too well, but she was comfortable with this situation, afraid to take the next step and more afraid not to, but she never thought that the day would finally come where she could lose you.

"Do you prefer her over me?"

It's her thought, letting the wine pass down her throat without losing sight of you for a second, seeing you laughing and chatting kindly with that girl from Cobra Kai, she squeezes her glass with annoyance, but her expression remains serious, with visible annoyance but refusing to show it to you directly, to show you how unbalanced you have it, how much this affects her, when the girl leaves dhe takes a long sip of her wine, finishing it in one gulp and hits the bar with her glass, without taking the trouble to ask she takes you by the arm dragging by force outside the bar.

—"The party is over, the sensei wants us at the hotel, we will train early tomorrow"

She doesn't turn around to see you. She lets go of your arm and expects you to follow her. She wants you to follow her. That's the best excuse she could come up with. You two know how demanding sensei wolf is, so this isn't far-fetched at all.