Not particularly threatening. But then, semi-form-fitting pastel-colored armor shaped to meet ridiculous body proportions and resemble a teeny-bopper's self-image rarely is, even if the arm-mounted Hitachi Magic Wand is pointy. Notice how all military gear is bulky, angular, and in ugly colors? Do you think that's because their fashion department is ahead of the times, or because they don't need a fashion department, they're the army, not an outlet chain?
Also, the whole point of power armor is you're basically wearing a tank. It's not fabric, it won't conform to limb movements, you need to have actual joints, unless you want her to have roughly the same mobility as one of those cheap plastic action figures where everything's a single molded piece.
