Lol.
Apocalypse doesn't have reality manipulation. And his matter manipulation and telekinesis are crap compared to hers. Half the time in his appearances he's amped by an external device and the "feats" still suck.
And she's a reasonable telepath, while he has next to no telepathic showings.
Her physical stats can be amped, if need be for close quarters combat.
She's functionally immortal by virtue of being an Eternal and can regenerate from being atomized. Her base durability is high and she's managed to shield the Avengers from a universal annihilation.
Sersi is everything Apocalypse wishes he was. She stomps.