From
https://findingmollie.iowa.gov/:
"On Wednesday, July 18, 2018, Mollie Tibbetts was last seen jogging in Brooklyn, Iowa in the evening hours. There have been no credible sightings of, or communications with, Mollie since that time.
Law enforcement is currently seeking additional witnesses and wants to speak to anyone who was in the areas indicated below on July 18, 2018
between the hours of 5PM and 10PM." (bbm)
Maybe I'm reading too much in to it, but the 5pm time frame seems a bit earlier than previously discussed. I'm guessing they just have some reason to be curious about the time leading up to whatever they suspect happened to her- this makes sense if they do have a perp in mind (maybe they knew the person was in town starting around 5 or something of that nature).
They aren't casting doubt that she was dropped off at 5:30 and texting with her mom though, right? If I read those two paragraphs together, it kind of sounds like they are. But, if I keep them as separate thoughts in my mind, I think it means that she hasn't been credibly seen or heard from since she was seen running, and then separately, they also want to hear from people at those spots from 5-10pm.
Just my thoughts.