Other than her Ice Age, to be really helpful you have to have at least decent items first (item dependent)
Well, I was the only Ice Mage in .06g while the MMH Times.
I did even w/o items well, my mates (in that times SkySilent for example) was always happy to have me ingame, even when i was ungeared in that time because the .04z codes wouldn't work there xD
Ice Mage is one of the least item-based chars in the game (after Elementalist)
Sure, the huge damage comes with every hero at the gear, but the dmg isnt that bad w/o gear, you still can solo every boss just takes time o.o
that's the way I play, works best and the team is always happy about an ice mage playing like this :3
best time using [W] is after u use [E] , and the best time for using [Q] is after u use [w].