I guess the moral of this story is, happiness isn't just handed to you, it...Okay now, I gotta get this off my chest first.
"The Plague"? I'm no doctor, but that doesn't seem like a disease name or even a colloquial use of one like the flu for influenza. This doesn't seem like the bubonic plague. It's a plague, but "the plague"? This is just really weird, that's all.
What was I saying? Oh yeah. Our Heroine's kind of a tragic fool here. You can't just expect to reach a happy ending just by following some script. She needed to grow and be whole as a person, and I don't think she ever realized that. This, combined with her lack of social skill that clearly stuck around is why she isn't getting her happy ending, and won't get it until she learns.