This Golden State by Marit Weisenberg
Poppy and her family are on the run, from something, or someone? Maybe the police? Poppy honestly doesn't know. She's never known. All she does know is she and her family have been running since, well, forever. Her whole life at least. So when they pack up and leave again, while it isn't great, she isn't surprised. Just surprised that she keeps making the mistake of thinking her life could be a bit normal, if just for long enough to graduate from high school.
But this latest move, things are different. Her mom especially seems different. The house is different and Poppy realizes that if she is going to get answers, she is going to have to start looking more closely than she has ever done before.
Recommended for 8th grade and up due to some mature content.