A while back my partner and I went out on a hike. We passed a group of people and one of them continued on with us. We were confused why she stuck with us, but

A while back my partner and I went out on a hike. We passed a group of people and one of them continued on with us. We were confused why she stuck with us, but tried to be friendly anyway. After a while we realized that it was a meetup group, and the lady thought we were just part of it.