well, it may take some time to fully test her (at lv100), as i'm at zero purple 3* shards and i may have little time to spend on lol vii playing.
I'm currently massively playing 4 SoT Levels (Kingdom of Sands Madness) to get through with all troopers as quick as it gets. Yet sometimes the Secret locations drop me a few stones.
From damage standpoint (by using a trooper version of her, fairly good equipped), her damage seems good-average. Not as good as Corrupt General/Wickerdog Queen or Gunner Bomber Boy, but ok.
Her power move - resetting the enemy energy points to zero might come in handy at boss fights or PVP and her passive (seal 1 random enemy move) seems good as well.