I have been around the block on this and am back to thinking Heather drove herself to PTL.
BBM - agree - I think she did drive herself to PTL. For the most part I am convinced of this because of the evidence that was presented at trial. While the time surrounding the restaurant was lengthier, there was no evidence to support a connection to any person interacting with her there. Additionally, I think you have to divide that time with the back and forth to the location and then finally going back to the apartment. I could see the car not being left at LongBeards, but why would someone not leave the car at the apartment when it was driven back there?