I have no idea what really happened to Toni. Only LE has a good idea of that.
I'd like to offer a different perspective, as I see so many posts suspecting the North KC PD. What if that cop is totally innocent? What if he busts his *advertiser censored* day after day doing his job because he wants to protect and serve? How terrible it could be for him to have this girl go missing and be found dead the night he pulled her over, and have so many people online speculating he killed, raped, molested or did something shady to her.
It is OK to wonder - that is what we do here, after all, but I'd request we look at the few facts we have, and apply occam's razor. Everything so far points to her driving off the boat ramp into the water. It has happened to other people several times before that we have seen here, in even more lit conditions than this totally unlit park with no barriers to the ramp (she never would have seen it coming till her car was already submerging). None of us can possibly imagine or suggest what Toni was doing, thinking or how she reacted to this event, not even her mother.
I don't believe the reports of the case being closed are accurate. They need a signed report from the ME before that can happen, and if her parents aren't going to push for a death investigation after that, there probably won't be one.