She really needs a mini-rework at this point. Her power distribution is completely messed up and she's extremely feast or famine. Get ahead and her Q will eat through anything. Fall behind and she does next to nothing but provide a wall that almost everyone can bypass.
Riot needs to stop fiddling with her Q and start experimenting with her W and E. Make them do more damage or add some more conditional CC to them so they feel relevant as the game progresses. As it stands, there is no reason to use her E during late game because it wastes mana that can be saved for 2 extra Qs. Her W just feels stiff and punishing to use. It needs casting tweaks to start. Vector Cast feels awful because it forces
to throw into a direction and the delay to click, drag, and release the skill adds onto the initial delay of the skill itself.