You raise an important question. Good detective work.
The only time Terri has been outside in years was when Morton Plant Hospital REFUSED to admit her after she starved for almost 7 days. They were obeying Atty Felos. Terri was outside for quite some time. She was not automatically admitted to get rehydrated.
Through the help of Freepers and VIPs in the Beltway, the IV was begun around 9:30 pm on October 21, 2003. (Terri left for the hospital between 5:00 and 6:00 pm and was outside being refused treatment).