Having been involved with SAR/R operations in the past I cannot see a circumstance the incident commander would allow someone suffering from a serious concussion coupled with severe dehydration being released to family. Lots of conflicting "facts" in the way.

Recovery from severe dehydration is not something that can be reversed in a few minutes with a canteen of water. Severe dehydration typically requires 24-hours or more at a hospital for intravenous rehydration at minimum for recovery and monitoring renal and other critical body systems that would be in process of shut down if the victim actually did go 12-days without fresh water. Under standard SAR protocols called LASH (Locate, Access, Stabilize, Transport) I would be very surprised if the incident commander would simply say, "sure, take her home and have a nice day" if the claimed condition of the victim are true.

More information clearly is needed.