She's laughing because she's free of that awful body and all those who would rather see her imprisoned for more awful years than be set free.
BTW, I don't hear you saying that you'd want to kept 'alive' like that if you were in Terri's condition. Oh no, not for you, just for defectives like Terri, right? That's the hypocrisy of this thing. You have waxed eloquent now for dozens of posts and not once said what you would want for yourself if you were in Terri's condition. Well, what is it? More slurry pumping, bedsores and diapers or be allowed to die? Well, how can justify forcing Terri to remain 'alive' against her wishes when her 'life' was so bad you can't even answer the question?