Storing a stun for use with her ultimate can turn the tide of a team fight.
Striking killing blows on minions with Disintegrate enables Annie to farm extremely well early in the game.
Molten Shield is a good spell to cast to work up to Annie's stun, so sometimes it's beneficial to grab at least 1 rank in it early.
Annie's summoned bear, Tibbers, burns opposing units around himself. Try to keep your distance from him after he's been summoned.
Summoner Smite can be used to help take down Tibbers.
Keep an eye out for a white, swirling power around Annie. It means she's ready to unleash her stun.