modsnip
It's pretty well known that these bars have security, especially the night of an event. Is it possible that Paighton was asked to leave the bar or even escorted out of the bar by security? Maybe by two heavyset men, maybe by an undercover cop? Or maybe by two friendly strangers that offered her a ride? And she dropped her ATM card in the parking lot of the bar, which could indicate that there was some activity or confusion after she left the building?
Any bar that has the amount of security that Tin Roof has, definitely also has surveillance cameras. The Police must know exactly who she exited the building with, and are definitely not releasing any info on it. The two reasons why are they don't want to spook the suspects and taint the investigation, or those men have been 100% cleared.
I wonder how far her parked car was from the venue? And if she possibly attempted to walk to it?