Hi, everyone! First post here, but haven't seen anyone mention this.
AT and BB were renting the basement of some guy's house. When you look at it on Google street view, you can see it's a pretty good sized house with a basketball hoop and whatnot. So people (probably an entire family) live right upstairs. This would've made it REALLY difficult for them to kill her at the house and then haul her body out to the car. Obviously not impossible, but it leads me to think she probably didn't die there. Also, the police said the last SIGHTING of her was in Wilber. I've always wondered if the homeowners were the ones who saw her. After all, they were probably some of the first people to police spoke with.
Also, I originally thought trafficking, but I don't think they would've taken her down to Wilber, to the basement of someone else's house, to traffic her when they easily could've passed her off somewhere closer to the interstate.
Anyway, my theory is that AT and BB found her on Tinder and set up the first date to get a feel for how... agreeable... she might be (I'm thinking the motive is sexual). Since they drove around smoking weed and SL liked BB, they thought they'd go for it. Then on the second date it was easy for BB to say "Hey, let's go back to my place. I've got some great stuff there that I didn't want to drive around with". SL agrees and they go there and surprise, AT is there. They all get high together, maybe slip something else to SL, expecting her to participate in... other activities. She refuses and says something that makes AT feel like she might get him in trouble. They tell her they'll take her home (either both or just AT), get her in the car, drive outside of the city, and AT attacks her and kills her (I believe I read that her phone last pinged just west of Wilber... this would be the time he deactivated the phone). They/he continue driving and get rid of the body.
I don't think they intended to murder her when they took her to Wilber. I mean, her phone was there, people saw her there... it's too obvious. Also, in regards to the body not being intact... that's definitely the rumor going around from people in the area (I'm in NE, too). If that is the case, I think that the idea that BB acted alone is definitely out. But I don't think she did anyway. I think it was AT's idea and BB was just willing to go along with whatever he wanted.