I have tested her with the E buffs, and I don't get why isnt her played.
She has a good burst (w, Q+Ult), one of the most powerful pokes as support i think
She has one of the longest CCs( root and stun i mean) in the game (3.25 sec)
With those buffs Karma got an Incredible shield. I have reached the 1000hp shield+ 50% to the rest of allies
With 45% CDR ultimate has very low CD. In a teamfight you can use it a few times
Any idea why isnt her played? I mean on soloQ, not competitive