She is Below Caiera AND Corvus was assisting her with Hulk...even during the time she used the spear on him (remember, he was slicing Hulk with that atom blade). She didn't fight Hulk alone, and even during that scene, Thanos also hit Hulk with a punch. If it was a solo fight, things probably would have went differently but that attack is a game changer but at the same time, she only used it once.