Ignore this **** please, the Eventhubs list is awful. She probably doesn't lose against those half of those characters.
It is still a bit early to state against whom she does well and not since the game is still young and many characters and match-ups underdeveloped (Peach being one of them). Match-ups that are bad now may become better, and good match-ups may get better. Anyway, most people would agree her worst match-up seems to be Diddy, and she is not very good vs Sheik, Yoshi and Sonic either. Some also seem to dislike the Villager and Mega-man match-ups because of their campy playstyles. Other than that I haven't heard of many unfavorable match-ups, but in exchange she does seem to have many match-ups where she destroys the other side either.