Well, she seems to like bubbles. Maybe they explode? I'm tempted to give you the idea to make her ability to steal things with those bubbles, but I think it's important not to go full JoJo. 

EDIT: Maybe she can do illusions with the bubbles? Make things out of them? Make them razor sharp and shoot them at people? Use them as shields? Lotsa stuff you can do with bubbles too.