Regarding who she spoke to, I presume that the guy on the left made his comment on the logging session to the person in the middle, and that she turned around and talked to them as a group. He was certainly talking to somebody, but I agree it's not clear who. Given that the forking joke from the guy in the middle seemed to be related to the guy on the left mentioning forking, I think it's reasonable to see it as one conversation, especially given the angle she would have been at when she turned around.

I agree it's not totally explicit, though, so perhaps they never did notice her.