Most people wouldn't want to die by starvation and dehydration. A drug overdose would be more appealing than that. What if you told the people "some doctors say your in a PVS and some doctors say you aren't. Would you choose to starve just in case the doctors that say you are PVS are right?" In that case I'm not so sure you can say most people would want to starve to death. It's not as cut and dried as you want it to be.
How many doctors said she is in a PVS and how many say she isn't? I'm talking about doctors who saw her? Almost always doctors disagree. What's important is the ratio of yes and no.