You're right ... this is the only place where I've heard anything at all about her car.
As for Danielle being affectionate with Richard, I've never seen it said that she didn't like him. In fact, the reports make it seem as if she was well aware of how great he was to her. I never really got the impression that she wanted to break up with him because she didn't care about him but only because she needed a break from the stress. It seems like her husband was still interested in reconciling with her, and if he and Richard were arguing on the phone from time to time, I'm sure that she must have heard about it from one of them. So maybe she felt it was just better for everyone if she took a step back. That would explain why she still went out with Richard even if they were no longer "dating". Affection could still exist, and maybe she wasn't 100% sure that she didn't want to date Richard anymore. Maybe they were broken up, then she was affectionate with him at the bar, and he felt confused. Perhaps he said something like "Are we dating or are we not?", and they decided to drive somewhere to talk before going home. If that were the case, as we've said, they could be almost anywhere, and I wouldn't even know how to begin searching for them or for an outside perpetrator.