While the FBI could be involved to chase down potential trafficking leads, I have a feeling it is more about the proximity to the Wisconsin border. I don't think there is any connection to YingYing. I haven't asked msobrien to take a look yet, but when I did some digging on fetlife just in case, Emily wasn't anyone I could recognize. I don't think Emily was actually that sophisticated in her involvement in terms of being part of underground forums and things of that nature.
I have so many thoughts and scenarios about what I think could have happened to Emily, but just don't think we have even the most basic details about the week leading up to her disappearance, or even about what happened during and after work or who was involved so there is so little we can actually talk about.