I hope they find her, that's a pretty desolate looking area. The local recreation area web site says they're having a water shortage and ask people to bring in their own water when they visit.
I know someone who works on an SAR team in a desert area. They said if you ever get lost in a desert area where there's lots of sand, just turn around and follow your footprints back the way you came.
Too often, people panic and wander around in circles, etc. For SAR, once they find footprints they just follow them and find the (usually deceased) missing person at the end.
ETA: Of course, this wouldn't work as well in an area that is rocky, etc.