Aftershock also gives Cooldown Speed and Energy Recharge, although less than Stormcrown, at 400 more gold it does much more damage and and gives CP to her which is more favorable than 200+ health. I don't feel the need to synergy the small lifesteal on it with Eve of Harvest either. Buying Clockwork as well is a personal preference since I believe the stats from both Aftershock and Halcyon Chargers will do enough for her, since most of her cooldowns are already low. If you're building more Cooldown Speed to bring up both of her B's then building straight defense would seem like the better option as her Shadow B will most likely be used only once a fight.