LET'S GOOOOOOO
She solo'd both the Cerberus and Minotaur floors (well, in terms of beating them, I had to put down a wall to bottle neck the Minotaurs for obvious reasons) to gather the materials for it since it felt more satisfying than just skipping them to grind.
I'm not entirely sure how it works, but judging by the wording, it doesn't seem to be purely a buff to her racial trait but I think it's instead an additional chance that will stack with both her normal attacks and with Rock Breath. Either way, it's an awesome boost for her!