Firelight by Sophie Jordan

Jacinda comes from a a long line of draki, or dragons. She lives with her pride who finds her important because she is a fire breather. The only fire breather to be born in centuries. After a reckless mistake, her mother moves Jacinda and her sister (who is not a draki) to the desert, hoping to kill the part of her that is a dragon.

I enjoyed the premise of dragons who can turn into people. I hated the mom and twin sister. They were exceptionally cruel, constantly saying how they wanted Jacinda's dragon side to die, essentially killing the part of Jacinda she loves the most.