Well, I was thinking, she mostly absorbed electrical energy, but discharged radiant energy. Maybe she could absorb all kinds of energy, but there is not much energy to be had in a rock falling or a bike driving, so she would mostly look for major sources of energy.
She would put her hand on an electrical outlet, charged up and blast beams from her hands.
However I also thought, she could create forcefields for protection. And... don't quite know the logical explanation for doing something like that.