Original Commentary

Yes, that is Jake in the first panel. Why is Kimberly being like this? She used to be a lot more devious before she settled down with Brisbane. And, well, if Emily wants to pretend that their friendship didn't change, well, that's probably what they were like in high school. Kimberly's probably wishing she still had that portable trapdoor... - Terrence

Modern Commentary
When I was re-reading this, I had a realization - after Kimberly left, Emily found a new set of friends. Then right about when this chapter started, Emily fell out with those new friends so now she's back to trying to hang out with Kimberly.
That's why we don't see Emily's friends here.

But now that I re-read this, you see that mostly-offscreen guy in the purple shirt in the first panel and the woman over on the left side of the second panel?
Brisbane doesn't know them. Must be Emily's friends. So as much as I like the above theory, it looks like Emily hasn't completely alienated her other friend group. I guess they like her enough to accept a free lunch. - Terrence