Ahh, of course. She assumes Seija means the opposite of what she says.
Ironically, that was the few moment Seija speak the truth.
For you to look at me and call me a hag, that's just obvious!!HAG!?Who's this hag...Who's this hag!?So you're the one everyone is looking for? I'm Yukari-chan!I'll rip apart this mere amanojaku and scatter her across dimensions......Or rather, you're an amanojaku-VS Yakumo YukariHohohohoo
Well then, run along now.