(The size of the power affects her energy level, but not any more then whomever she's using the power from. She's been using her power for a long time, she's not some newbie whos just getting started. It took a lot of practice and effort. I'm assuming that the temp drop is pretty insignificant compare to the rest of Gina's powers. It wouldn't have taken very much effort on Kate's part to counter what Gina did, so Kate wouldn't really have been affected.)