Umm, last time I checked, she's beaten up De_su + Hina, then De_su + Boku, then Shinku (twice), then De_su + Boku + Hina... then barely lost to a motherfucking hax. Did I miss something? Not exactly a bad record, if you ask me.
She needs to learn to finish off her enemies, though. Season 2 was a good start.