Leave Jelena alone. She's a very talented player and she's proven what she can do, without injuries.
If her wrist is ok (and no other injuries) she could definitely do it again in 2013.
She's talented, but you can't fight age. Every comeback is going to be harder and harder because she's getting older and more susceptible to injury. All of us for the most part wish for a successful return but she's already has a few of those, culminating with her KL win.
Being fit will probably help prolong her career. The wrist is a really unfortunate injury because it has nothing to do with her fitness level.