I can so understand her parents, because she's their child, and it must be so hard for them to let her go. For the past 15 years they got used to the idea that that's what their child is like, and letting her go now would be the almost same pain for them as letting a healthy child die.
That being said, I absolutely hate what the politicians (and the church) have made of this poor woman's life and death. They turned it into media circus, and yet these things happen all the time, every day, nobody mentions it. There are laws that regulate it, and while the laws may not be perfect. they should be respected, enforced, or changed. Or are they willing to give every patient about to be taken of life support the same amount of attention?
I strongly believe life is sacred, but there's a difference between killing somebody and letting somebody already so ill - die. Isn't that respecting "God's will"?