W - Seismic Shove
Cooldown increased from 12 at all ranks to 16/15/14/13/12
Since Taliyah maxes her W last, that cooldown won’t start decreasing until level 14, when she puts a second point into the skill. The only other mage with a basic displacement ability is Syndra, whose _Scatter the Weak_ is an instant cone and can stun afterward if she lands a sphere.
This huge cooldown nerf will hurt her laning badly, leaving her vulnerable for a long time if she misses a combo. You said she would be balanced around both roles, but right now she’s so strong as a jungler that she’s barely played mid. Changes like these could reduce her to a troll pick.