It does all come down to the timeline. I agree and I am so frustrated that we do not really know what time she really went missing. The last time I feel certain about is the 3:45 time--when the mom and her kids leave the park and say goodbye to Jorelys. After that, the sighting is apparently from the babysitter I believe. And I am not sure if i trust that because she may be trying to cover her own movements, so IDK.
I am leaning towards the possibility that the babysitter went away for a quick minute, then JR left to get drinks, then the babysitter came back and was told that JR was getting them all drinks. Then finally at around 5 the babysitter began to really worry and then the ball got rolling. But imo, she may have gone missing between 3:45 and 4 ish.