I don’t have sources to back this up, but the consensus is that University Police found and viewed the video and reported it to the Police. Articles (phone and water bottle) were found at the location, I think I read earlier by her friends searching for her. At the same time the police got a report from the husband. The possible explanation is this, her husband found her phone location on an app, went there with whoever discovered the items, called University Police, they came, viewed a security video, and reported the info to the Memphis Police. The husband called the Memphis Police to report her missing as well. It may not be exactly how it all happened, but it does fit all the pieces in a very brief tweet together.