As much as from a character point of view I'd like to see her happy as it's a sad story, I think it would really retract from the horror and tragedy element if they just ended up with, as someone said, a fairy tale ending. I like it as it is, especially when you beat the dungeon and even with the victory fanfare you can see your own personal character doesn't look too happy. It's very different from the rest of the game and the story maintains an eerie atmosphere even after you've completed it.