In one of the out of game stories they essentially wrote that she went rambo on the legion and fucked up demons on her own guerillia style (because they couldn't be arsed to write her properly into the story). That was already back in BfA, so technically they have that covered and (at least tried to) made her look like she is this god tier mage. So they have their asses covered on that one, even if it is cheap and not very believable.