1. Use your Flame spell. As she lands from a jumping ground slam, roll away and shoot fire at her so that she takes damage over time. 2. She rolls 3 times. Dodge the roll at the last second. After her third roll you can attack, this is a good time to replenish your magic. 3. When she rains snowballs, look for the shadow they cast on the floor and dodge away until you find an opening to attack.