Miss Pytlickova, of the Czech Republic, was murdered by Waimate man Jason Frandi. Both their bodies were found in remote South Canterbury back country on Sunday.
Detective Senior Sergeant Marion Neill, of Timaru CIB, said the police inquiry was now focused primarily on trying to establish Miss Pytlickova's movements after she left Cromwell on Saturday afternoon.
"On Saturday, we believe that she left Cromwell around 2pm, and was intending to hitch hike to the Timaru area.
"It's likely she was in Omarama area by around 4pm, and in the Kurow area possibly by 4.45 or 5pm. However, we still wish to keep this time span as open as possible.
"Our hope is that publishing these photographs may prompt people to come forward with any sightings or information that will help us to track Dasha's movements.
"We are especially keen to hear from anyone who gave her a lift on Saturday."
