Due to the known fact that Floyd quickly disabled his Livonia victim with a punch to the face...I would imagine that Dani's fate was much the same.
I just don't imagine a conversation taking place between FG and Dani in the parking lot. Rather, I'd imagine he quickly gained control of Dani through violence.
Yes, I do think it didn't take him long to gain control of her and also through violent means

, but once they were inside her car. It was only then he showed the ugly part of him only his victims have seen.
I
have to think they were seen by someone(s) who were able to identify both of them and together in the parking lot for the very reasons Momma2 talked about.
And if so, the entire crime -not only assault, kidnapping, etc., but murder, as opposed to anything accidental (e.g., "We were just 'hooking up,' and when we got back to my place, she
wanted me to choke her -I am not going to be graphic, but if you know what I mean ...-, and the next thing, she was dead!")-, was premeditated, IMO: Danielle knew who he was, and she most certainly would have gone to LE, and he had to know that.
I believe this is one of the reasons why it is so important that she be found because he would likely use the "Everything was consensual" BS once charged. Evidence of massive blood loss on the part of Danielle ...

... in the Berkeley house, garage, car, etc. would be pretty damning, too, but we all want to make absolutely sure this "man" goes away for a very, very long time -while making sure Danielle is brought home ... for me, I think that would be what I want more than anything ...-, and I am confident that is exactly what LE is working on.