She walks into Brian's bedroom.
From Create Your Own Story
Kate wonders what's taking so long, and silently she starts to walks into Brian's bedroom just in time to see him slip something into a glass of coke. Unnoticed she pulls back, and walks over to the window, standing in just her long T-shirt the vent under the window blowing cool air up against her naked thighs sends a tiny shiver through her. Pretending to look out into the courtyard she pretends nothing is amiss. Brian returns with the coke, "Sorry it took so long, I only have those classic cokes that you need a bottle opener for, and I couldn't find it." He lies. Kate knows somethings up, but she also doesn't want to go back to her room alone.
Knowing something's up what does Kate do?