YA about a girl in juvie who has fire powers, read in 2017

[Erin]

This book was told from the point of view of a girl in Juvie. One day a ten year old comes and they meet and she finds out the girls can control fire. I think it was published around 2012-2016

[Kris]

Burning by Danielle Rollins seems to match your description.

(Google search -- site:www.goodreads.com "young adult" "fantasy" control "fire" "in juvie")

[Lobstergirl, au gratin]

Erin, was "Burning" your book?