I think either is possible because we just can't see into this enough with the limited information we have.
But the 'Let's go for a ride' doesn't work for me because I don't see her completing her day and planning for work the next day, and fitting a 'ride' into all that at the end. And if it happened on her jog, I don't think it makes sense because why would she change her focus and stop that activity to hop in a car with someone. Certainly if it happened on her way to her mother's house, it makes no sense. If it was a meeting somewhere, I would think someone might have seen them, or if the meeting was a lure, what was an acquaintance driver going to do to contain her when it became clear to her they weren't going to burger hut or whatever. I suppose the person could have had a weapon, but that eliminates the 'something went south' scenario and enters the planned abduction realm. Where is this person and why has no one noticed strange behavior or other signs of change or stress? And why has LE focused on WC since Mollie did not know him?
I also don't think she'd take off for a meeting/get together, sweaty and in her running clothing, still wearing a FitBit. So I think she was likely grabbed in an opportunistic moment and it could have been someone relatively familiar, be it someone who either had been watching her, or recognized her when seeing her that evening and she was the chosen victim. Or, a stranger got her.
The latter makes sense to me because of so many cases where female joggers left for a routine run and were soon dead. The Karina Vetrano and Vanessa Marcotte murders are chilling examples, and even in the Jessica Ridgeway murder, the perpetrator tried to victimize an adult female jogger first. They were all literally ambushed. One was able to get away because the perpetrator was too surprised and unprepared to fight with his victim and he could't subdue her. Since we don't know where Mollie was, if she was on an outskirt as someone suggested, it was a grab and go, with perhaps knocking her down first, as in the Shunick case. I've read at least three cases where women were grabbed while talking on their phones. And Kelsey Smith was taken in a Target parking lot when she walked out and was followed to her vehicle.
There are people who simply prey on others and they do bold things that we can't imagine. Their victims are strangers to them who were just going about their business. But like I said, either is plausible since there are movements by Mollie we simply can't see.