The court is run by falliable men. In Florida, the courts have proven to be particularly falliable (see, the year 2000 election). You are comfortable with them giving the decision to someone who is, firstly, basing her wishes on something he just heard, rather than anything written - second, has questionable motives - third, who has relatives who say her wishes would be to live (please note, she is a Catholic, and thus has a strong bias against euthanasia). Furthermore, you are also comfortable with them rewriting the bias in such disputed cases to allow death - not just a pulling off of life support, but starvation and dehydration, a very painful death indeed.
Re-read what I just said. Think about it. And if you actually think that killing her still flies, then you are, quite frankly, morally impaired.
Ivan