I think this was reported much earlier but the whole thing was so confused that it might not have been picked up on.
If she
was there for several days, it's all the more puzzling that she didn't phone her family to wire her some money and then make it to the Walmart in Parker to pick it up. I'm not clear exactly where her car was left but it was close to both the Earp post office and the Oasis mini mart. Even if her mobile phone battery
was dead and she was unable to charge it in her car, she could have gone to either the PO or the mini mart and asked to make an urgent phone call, even if she had to pay $1 to do so.
The 13th of May was a Saturday. Even if the PO might have been closed until the Monday, maybe the mini mart wasn't. Either way, if she was near her car for several days she should still have been there on the Monday.
ETA that Earp PO was closed on Saturday and Sunday but opened at 8am on Monday.
http://www.postallocations.com/ca/earp/earp
If Sandy arrived in Earp early on Saturday evening and was alive near her car for 2 or more days, she had to have been alive when the PO reopened.