The First Firekeeper Cycle. THE MAURITIUS ELEMENTAL TRILOGY, #0

The First Firekeeper CycleWhen the sea takes her homeland, an unnamed voyager washes ashore on a raw, volcanic island still in the throes of its own birth. Here, the mountain breathes with sentient fire, the forest archives the dead in spiraling roots, and the sea hoards the memories of the drowned. Chosen by forces she does not understand, she must become the first Firekeeper-a bridge between the living and the lost, tasked with binding the island's grief before its hunger consumes everything.
But to save this new world, she must sacrifice the last piece of her old one: herself.