The details aren't quite right. Bonnie shouldn't be holding a gun, and she should have a crutch and be wearing a white fur cloak.
This is Bonnie the runaway from District 8 (as the title suggests), she only appears in one chapter in the entire series, her and a woman named Twill. But they are the ones who inform Katniss about her Mockingjay status and her role within the Uprisings.
To be honest the reason I wanted to draw this girl despite her small and seemingly unimportant role in the books is because she is described to be wearing a Peacekeeper's outfit that is far to big for her because it was intended for Twill's husband but he was killed.
I just wanted to practice drawing baggy clothes on a small girl.