Presumably for the sake of these polls the relative power levels of the two combatants are comparable, bringing the fight back to the level of the two women in question. With that being the case, Supergirl will be in for a rude awakening. She isn't a trained warrior like Wonder Woman, and is also convinced that Uberfrau won through by cheating in some way. When she discovers that Uberfrau didn't cheat but is actually capable of everything that the last match implied, the young blonde's game plan will fall apart. The initial back and forth battle will wind up as a one-sided devastation at the hands of the German warrior, who wants to finish in such a dominant manner that any other heroine who dares to challenge her will be intimidated and thrown off her game even before a battle begins. As such, she's likely to use the overmatched heroine as an extremely graphic demonstration of Nazi superiority.
-JM