If Hannah's last text was at 1:06 and "she was lost at 14th and wertland". Notice what's nearby on the map link...UVA School of Nursing
http://goo.gl/maps/W04UG
I would think just based on the timeframe she, and her phone, were still at Tempo, or she was just leaving there. Another report said "I am coming to a party but I am lost". Perhaps she was leaving tempo with JLM, disoriented, the drug was kicking in and she was asking for help from her friends? JMO
http://wtvr.com/2014/09/17/police-now-think-hannah-grahams-last-text-listed-incorrect-location/
http://www.c-ville.com/hannah-graham-tracking-investigation-far/#.VFlrMhybXls
From the article above:
1:06am Saturday, September 13: Graham makes contact with friends for the last time, sending a text message telling them she’s lost in the area of Wertland Street—a mile and a half from where she actually was. (Police initially said that message was sent at 1:20am.) In the next two minutes, two more security cameras capture images of her walking east on the Mall, half a mile from the Shell station. The first is outside Sal’s Caffe Italia (4), the second a block east at Tuel Jewelers. A white male is briefly seen following her. Also visible in the footage is a heavyset black man with dreadlocks dressed in what appears to be a white shirt and shorts. Witnesses later report spotting Graham at Mall restaurant Tempo with the dreadlocked man not long after. It’s the last sighting of her.
I think the video in Tempo and outside of Tempo are critical. We know there are outside cameras of the next building over, Otto has a great pic, I'll bet they have inside cameras as well, especially for liability. JMO