Apparently you missed the point altogether.
This "nurse" has already proven to be a liar by repeatedly changing stories and sources and claiming things that disagree entirely with all court testimony provided by both Terri Schiavo's own doctors and nurses and those provided by the Courts.
It wouldn't matter if her story was engraved on stone tablets -- she's a liar. She didn't come out all the other times her feeding tube was or threatened to be removed. She only showed up now because the story has suddenly gotten national attention.
Here's something to think about:
Don't you think if her story had any shred of credibility that the lawyer for the parents would have her showing up at every possible opportunity to give her story to the judge?
