I was also wondering where her shoes/phone were found. Were they outside in the patio? When were they found? That night or the next day? My thought was that if they were found the next day, could someone have taken them back there? I don't know why it makes me wonder so much!
After she lost her shoes but before she went missing she was seen by a bunch of people, who clearly must have noticed she was not wearing shoes.
Even her "missing" flier says she was barefooted when she went missing.