People can pretend they are Gods of Krull or tell you to learn your class, but the truth is, a well played Sky is a bitch to kill. The only advice I can give: 1. Like EXXCLUSIVE said, go into assassin mode. Hide in the bushes, wait for your speed burst to activate, then run out, and be sure to auto-attack her, because there is a small snare on the first auto-attack after shadow empowerment. 2. Use shiversteel. 3. Don't open with the stun. Use boots to sprint out and auto attack...

I've taken breaking point out of my options for krull. Sorrowblade, Tension Bow, or even Bonesaw would help more at this point. The problem with breaking point, is that now you have to live and be in battle long enough to actually have it be effective. It doesn't help vs jungle, and by end game, its usually 3v3, so fights are over within a few seconds. How many stacks can you get of breaking point in the time it takes to wipe the other team? It just doesn't see worth it anymore....

I tested clockwork for tension bow cooldown, and it is also not affected. As a secondary option, consider tension bow. A little bit of armor piercing, and some weapon power, plus a nice hit on initiation. The psychological effect is probably more important than the actual damage. If you jump out of the brush with tension bow ready + deadmans rush, it's going to take a nice chunk of life away. I don't care who they are, they'll be running. :D