She generates a cryo shield like Diona. Her shield has 100% uptime, and will periodically fire night stars at enemies. Her Q is a cryo disco ball.
Her C4 gives flat damage to NA and CA based on her HP. The scaling on this is actually good.
Can do full HP build or HP, cryo, crit. Tenacity, blizzard can be used. Khaj-Nisut can be used to give a lot of HP.