Erica Smith, 23, was driving on Loop 410 with two passengers when the vehicle driven by 28-year-old Jenny Ybarra was driving the wrong way and collided with Smith's vehicle near Loop 410 South and Rigsby Road, police said.
Ybarra was legally intoxicated, police said.
When emergency personnel and police responded to the scene of the crash, a yellow sheet was draped over Smith, a normal practice by EMS at the scene of a fatality.
But when the Bexar County Medical Examiner's Office responded to claim the body, investigators found Smith to still be alive.
Smith is still in critical condition. The actions of the EMS personnel are under review.
UPDATE: Smith has died. (KSAT-12)