Hm. After looking at her notes currently on Surrenderat20 (not complete yet), I'm a little saddened that the passive is on such a long cooldown. I get the goal of it there, but I think that a more common but smaller shield might have lead to more interesting target prioritization options in the mid-to-late game teamfights. Depending on how short this CD ends up it might end up fitting my vision anyway...we'll see.
Also, cooldowns at rank 1 are as follows:
Passive - 20 seconds (looks reducable with level and/or cooldown?)
Q - 9 seconds
W - 15 seconds
E - 16 seconds