You're using inconsistent terminology - "wants" and "allows". As if God wouldn't "allow" her to live or "want" her to die.
"Allowing" means not standing in the way of something happening. To that extent, I'd agree that God doesn't seem to be standing in the way of anything in Mrs. Schiavo's case. That means (drumroll please) it's up to mortal man to act, as I said before. And read over what I quoted from the book of James again.
Are you ready to say He wouldn't?
Maybe this will help... Although the Gospel is simple, God's mind is not. His thoughts are not our thoughts. His ways are not our ways.
What I do know is that He is perfect, omnipotent, omniscient, omnipresent, just, love, eternal, unchanging, sovereign and holy. Thus, I have no need for worry. In the end, everything turns out exactly as it should, whether or not you or I do the right thing.