why does kyouko ask izumi about the ‘couple’ thing in first book/episode?

canonically they don’t start dating until i think half way into the next year and she confronted him in (probably) october so whaaat?

i’m referring too when hori goes ‘did you say we wouldn’t make a good couple? we’re talking about you and me right now, not tooru.’ why did she get so upset.. well of course i know why, she had feelings, but damn, wasn’t it a bit early? was she already into him? they’d been chilling together for not that long and she said to his face that she (basically) disagreed that they wouldn’t be a good couple.