If you have any way of draining mana and reducing healing on target use this on her! But that should be the strategy with most casters anyway. As a hunter (60), I pulled her with viper sting which drains over 1000 mana, then had my boar charge her, then stunned her with boar, applied another viper sting and at that point she was just chasing me around totally out of mana and fucked just like the players who face me in pvp ;)