well i played annie support a lot , and i had about 9 wins and 1 lose with her but in one of the latest patches she got nerfed for support and buffed for mid , because her base damage on spell is lowered and her ap ratio is added more , and as support you have to focus on wards and mobility , not on ap.
She's awesome and fun to play, just try not to get caught in a fight, because she doesn't have any escape mechanisms besides Summoner Flash and her stun, assuming it's stacked...