No rework! NOOOO!
Her rocket jump needs a bit of a cooldown reduction buff imo. It's 20 seconds. 20 SECONDS! (Then by the time you are like level 13 it'll be at a not-so-bad 10 seconds)
And she gets very low reserves of mana in the firstplace, so she wouldn't be able to spam it nonstop anyway (a buff here might be nice... But, I'd like a cooldown one more).
I really haven't had any issues with the DoT skill or any of the others. Just rocket jump is a pain in the ass. Knowing if you use it to hop over a wall on the way to somewhere it's going to be unusable for a long while.
The refresh on cooldown is a nice idea but, you rarely get to use it to finish people off, since normally in order to do enough damage to kill someone, you have to jump in on them. So a cooldown buff here "might" also help you to use it to finish them off when they are running away.
She is "just" below what a normal ranged carry I think should be. But a few others like Sivir are below her.
I for one, like her passive, and her ult for that matter. x.X