Abby question

Hey all, I just got done watching the last episode, and while I was looking up the cast of Nexus, I saw that the young girl/prostitute in the episode was also listed as being the same character in this episode. Unfortunately, I just deleted it from my DVR so I can't rewatch it, but I was hoping if any of you can tell me when she was in it? And if so, why did she not really know Frank in Nexus? Thanks!