She certainly needs to revisit her Living Will. It's a confusing document, and she may not really want to be starved and dehydrated, EVEN IF she is in a coma or PVS.
Given the propensity for the court system to override a living will, I'd recommend adding a clause to your regular will stating that "if the terms of my living will are not followed to the letter, regardless of reason, then every damn penny of my estate goes to the moonies" or something to that effect. With fond memories of WKRP.
And even if she had wanted such a think, her recent experience may change her mind.
I do hope her relatives can talk to her in front of a camcorder, though. Even if she weren't considered to be of sound mind, an oral recitation that she did not want to be starved or dehydrated under any circumstances, especially if she said further that she never wanted to be [the latter commnent would mean that even if she wasn't deemed fit to override the living will, the ambiguity in its language caused its marking to be other than intended].