Best frenemies forever / Megan McCafferty.

Enhanced descriptions from Syndetics:

From mega-bestselling author Megan McCafferty--author of the beloved Jessica Darling series that The Wall Street Journal called "Judy Blume meets Dorothy Parker"--comes a hilarious love letter to the magic and heartache of middle school friendship.

Sophie Dailey is NOT looking forward to starting middle school. For one thing, she doesn't look like other kids. Instead of trendy tank tops, she wears high tech shirts that block UV rays. (Sun protection is serious business!) And she definitely doesn't sound like other kids either. (She can't say "holla" or "hot take" without making a weird face.) Needless to say, this is probably why her best friend, Ella, ditched her for Queen Bee Morgan.

Sophie is comfortable with who she is and doesn't want to change. But she's also pretty lonely without Ella. Even worse, Morgan seems intent on making seventh grade miserable for Sophie, and Ella doesn't bat an eye at the bullying. Then a new girl moves in next door to Sophie. Kaytee Ray is everything Sophie is not: fashionable and super-confident.

Sophie can't believe Kaytee wants to spend the last days of summer with her. Determined to keep Kaytee as a friend, Sophie lies about her social status, claiming to be besties with Morgan and Ella. As long as Kaytee attends Villa Academy--a private school on the other side of town--she'll never find out her first friend in New Jersey is a loser.

But can any friendship built on lies survive seventh grade?