Just thinking about Akh's comments above and remembering times I have seen people kicked out of bars (it's true, I have never seen a bouncer/ bar staff concerned with whether or not the person had their belongings. Usually this is because they were kicked out because of fighting or causing some kind of disturbance and were pretty literally thrown out the door).
Together with Gabby's comments, this has me thinking about the early rumors about the 'altercation' starting before they arrived at SW. I've wondered before whether rumors about being kicked out could have been related to a conflict starting at the bar. [Total speculation ahead, but] this kind of scenario would actually make way more sense to me than the idea of the bar kicking LS out for talking about drugs or being messed up (as some have suggested). For example: CR and LS run into Lauren's (and/or JW's) friends, there's some arguing/ shoving,
CR gets kicked out, Lauren runs out after him.
Or... take being kicked out out of the equation. We know Lauren was talking to other friends in the bar (from TG's witness, at least), so her shoes and phone were probably left at a table with other people (hence not being stolen). There's some kind of tension or conflict (actual or anticipated) between CR and these other guys and Lauren doesn't want to be seen leaving with him - or maybe she doesn't want others to know she has left at all and plans on coming back. Any of these type of situations could explain why she didn't go back for her shoes and why no one ran after her with them.
Or... maybe she was just out of it enough at that point not to care about shoes. And maybe her 'friends' didn't care either. After all, we know that several people (not just CR) saw her leave Smallwood shortly afterwards and it doesn't look like any of them ran after her to make sure she had shoes or was okay either
Anyway, I'm not even sure if it matters why/how they left the bar, but I've always felt like the 'altercation' at SW may help to explain some of the odd events on either side of it in the timeline. Like Gabby, I think there's probably more to the story than simply being messed up.