She wasn't "written into a corner," she had some of the best potential of any of the characters. If they were going to keep her around, they simply wouldn't have "powered her up" to the levels of "The Gift."
Those with actual power behind the show disagree.
That that solid fact trumps any opinions we may have.
no, they said that apparently after the fact, and after coming close to dumping Wang first. So that doesn't hold a lot of credibility. Again, if someone can point out stuff said about her being hard to write for long before the fourth season, then I could buy that argument a little more.