Esther Dingley, 37, went missing nearly two weeks ago while hiking alone
A dog walker said they saw a figure lying down in her campervan on December 2
Officers dismissed the van sighting, saying it was a plain clothed forensic officer
Spanish Civil Guard have suspended the search for her because of poor weather
They said conditions in the Spanish Pyrenees mountains make it 'impossible'
Investigators have confirmed they believe her disappearance is either the result of 'voluntary act, or as a result of someone else’s actions'