Heh. This actually happened in a comic. And while it obviously didn't end with death, it went on long enough to give us some information. Jenny was being mind controlled, but was given enough awareness that she was using the full range of her creativity in her powers. Anyway, it was a stalemate for quite a while until Habib realized that he needed to stop her in order to put an end to the fighting that the Authority was engaged in. So he started to attack harder, and Jenny was visibly in pain.
So not definitive, but as much evidence as we have to go off of. Not to mention Jenny's rather embarassing telepathic weakness. For a being who can swallow supernovas and create quantum portals through space, time, and other dimensions, it's really a horrible glaring flaw.
Take those two together, and it's as informed an opinion as you'll get on the fight. If you want to back jenny, feel free. As we see from the fight, they're incredibly well-matched. But the evidence to support it isn't there.