The figurative language is a metaphor. That is because she didn't literally burn out by one fierce moment of fire, it's a metaphor to show the strong burst of emotions that she had at that moment that made her feel as if she was burning. It could mean either that she got angry or fell in love or anything similar.
Literary work in which special intensity is given to the expression of feelings and ideas by the use of distinctive style and rhythm; poems collectively or as a genre of literature.
