IIRC, there were statements from people at the bar that Brenda's vehicle was parked in a different spot at the END of the NIGHT, than it was when she first arrived.
I don't believe this was brought in as testimony, though.
There was speculation that she went by her house (cause she knew Danielle was already missing, and wanted to see if she had come back from her usual 'runaway from home' routine. The routine the boys said she pulled before. Wouldn't come home until someone came and found her.