Here is the description of BURN OUT from Kristi's website:
The last girl on Earth…just got company.
Most people want to save the world; seventeen-year-old Tora Reynolds just wants to get the hell off of it. One of the last survivors in Earth’s final years, a teenage girl yearns to escape the wasteland her planet has become after the sun turns “red giant,” but discovers her fellow survivors are even deadlier than the hostile environment.
Doesn't it sound amazing? Hope you guys check out her book!