Me and the Blonds by Teresa Toten

From the back of the book:
Sophie Kandinsky has spent the last six years trying to keep her crazy family life secret. The devil is in the details. The first detail is her larger-than-life, eccentric, Bulgarian mother. The slightly larger detail is the fact that her gentle, poet-father has been charged with murder. All Sophie wants is to be adored and invincible, which is really hard once people find out her father's in prison. But this time, after yet another move to another new school, and another opportunity to wipe the slate clean, Sophie has devised a plan. On her first day of school, she will locate the Blonds - that clique of perfect, confident girls who are beyond gossip and reproach - and she will make them her friends. This time, no one will find out the truth. This time, everything will be brilliant.