I had a brief exchange with Nathan Zachary on the subject of "tube in - tube out," and neither of us was able to come up with a chronology.
It's possible that both contentions are true. The evidence [that "we" have] is not unequivocal. A feeding tube was provided in 1990, no question; unknown is whether there was an interim period where Terri was fed by mouth; that a feeding tube was present in 2003 - 2005 is also agreed. But I've seen no accounting for the entire period from 1990 to 2005.
If you read her discharge summary from the hospital, which I linked above, you will see that she had the feeding tube inserted AT the hospital. Not after. And was never fed by mouth after that. She failed three years, consecutive years, of swallow tests. At which time it was recommended they be discontinued.