Maybe it proves it, maybe not, but according to the episode, Lisa had to go to Hell with the rest of her family...

I'm still unsure about that episode... it wasn't a dream, it wasn't Halloween. But the ending was quite unusual for the Simpsons episode. Maybe it was writers' joke after all, but nevertheless, Homer's act was so selfish.

On the other hand, I doubt Lisa would be happy in Heaven when the rest of her family is suffering...