Specifically this episode you missed her talking to some people, and getting stripping down to her underwear in a changing room with a couple of girls.Welp, seeing the comments here, I'll skip this month too. I think I haven't played since 0.2 (with the first guitar session) and it looks like I didn't miss much.
I agree with Angmir above, in so far as there's clearly loads of sexual opportunities for the other girls to get involved in. At this point we really should have walked in on Nicole getting screwed or something. It wouldn't be out of character for her at least, even this early in the game.