Why does Quinn Fabray never get a Happy Ending?

Not a Wellesley related post at all but I think it needs to be said.
As requested by D, there are spoiler alerts following in this post.

WHAT ON EARTH ARE THE WRITERS OF GLEE DOING WITH QUINN FABRAY???

Seriously...what was this?

Seriously though. I feel like she takes the fall for basically everything. When things are getting tired on the show, they drastically alter something about her character. They really can never let her be happy which sucks because she really is one of my favorite characters. She was smart, and had aspirations outside of the performing arts even though she enjoyed singing in Glee alot.

I get it that in the first season, it makes sense. It was the huge plot twist that the "Beautiful Blonde Cheerleader" gets pregnant and hits rock bottom.

Even the Lucy Caboosey stuff makes her character really interesting. She worked really hard to become the Alpha Female and it adds more pathos to the fact that she completely messed things up. The allegory of the Perfect Christian Girl's world falling apart was kind of tragic and added a nice layer to the story. Her parents divorce and yet she perseveres.

But really. It seems like when Quinn is in the spotlight she is either completely deplorable and attention seeking, or having to work back from another bombshell that the writers just dumped on her. Usually a negative thing happens RIGHT after something positive has just happened to her. They also constantly say that she is beautiful but that seems to be grounds to be smacked down on Glee

For example: Taking Dad to Chastity Ball. Gets Pregnant and kicked out of the house.
Runs for Prom Queen. Finn cheats on her with Rachel and she loses to Kurt.
Gets into Yale. Paralyzed.

It's been a long time since we've seen this girl. Can we have her back?

What's next? About to Graduate...Dies? I really would not be happy with that. There's really only so many times she can have bad things happen to her and try to rebound like she's needed to in these past 3 seasons of Glee. I want to keep rooting or her but the writers keep making her happy ending impossible. I'm kind of getting discouraged