How to balance Annie without taking power from her
Seeing how Annie can zone you just from existing, makes me feeling she need some changes, and with the Worlds coming, i believe this is a suggestion Riot should use to improve the balance they are talking about.
Make her passive works as Ryze one: You have limited time to "stack each stack" and also a limited time on the last stack or it disipates (Annie's E can't recharge the final stack).
With this change I believe she can still zone you like before (in both mid or support role), but not in a opressive and "if you come you die are stunned", while give counter-play.
Have a good day