Massie by Lisi Harrison

Okay, I know, fast food read, but....I have to keep up with my girls! From the Clique series, a group of books about an alpha group of girls at an exclusive private middle school is invaded by the daughter of a family friend who moves into the guest house (!) to ride through some tough times. It's supposed to be temporary, but turning out to be permanent, as the father turned down a job opportunity in the town they moved from to stay in New York. In "Massie", spoiled, perfectly dressed Massie must get a job to pay for lessons lost when she is kicked out of the exclusive riding school after a cruel prank played on the owner's niece. She finally settles on peddling an exclusive line of make up to the less fortunate in a rather mean way, and in the end learns a thing or two about kindness and inner beauty. Massie still hasn't learned everything though, she uses her status as a super seller to get what she wants in the end.