The last master of humanity, Chaldea's master, Alaya's Champion, the Pruner of Lostbelts, and a bunch of other titles were dumped on her due to her nigh-impossible feats of saving the world multiple times.

A supposedly average human with below-average skills in magecraft could become the saviour of humanity was something nobody expected.

Her uncanny ability to lead no matter what and her insane charisma overshadowed her inability for magecraft.