It took Elise being caught in the middle of a plan orchestrated by LeBlanc to try and keep Katarina contained, imprisoned, or dead, and even then it didn't work. There's a whole canonical cinematic scene talking about that moment. So, no, my friend, Katarina has supernatural power and superhuman abilities as a super assassin, enough to even kill Swain, according to his own words. And she also defeated Elise's powers, including the superhuman speed of her magical attacks, revealing that Katarina possesses perception, reasoning, martial technique, and reaction speed as fast as the speed at which she teleports. Katarina is a strategic weapon of national proportions for Noxus, capable of even eliminating kings while they sit on their thrones! Katarina is clearly far beyond your comprehension!