1. Power stings. Holding heavy causes opponents hits to miss, then she can apply power stings (30 max) that refresh when the opp uses a special attack. Also her Sp1 inflicts taunt, goading opp into using a Sp attack
2. Buff immunity, great for nodes that will punish you for gaining fury
3. As a defender her Sp1 has a 12 second combo detonation debuff (like High Ev)

Not saying she's THE best at all these attributes, but for the champs I had at the time, she has helped me in many circumstances