Young adult novels

• Wonder (1991)'
• Do-Over (1992)
• Ever After (1994)
• Daring to Be Abigail (1996)
• The Friendship Ring series
• If You Only Knew (1998)
• Please, Please, Please (1998)
• Not That I care (1998)
• What Are Friends For (1999)
• Popularity Contest (2000)
• Fill in The Blank (2000)
• Never Mind: a Twin novel, co-written with Avi (2004)
• If We Kiss (2005)
• You, Maybe
• Lucky (2008)
• Gorgeous (2009)
• Brilliant (2010)

Children's picture books

• Over the Moon, illustrated by Scott Nash (1998)
• Sometimes I'm Bombaloo, illustrated by Yumi Heo (2001)
• Mama Rex & T series, illustrated by Steve Björkman (2000-2003)
• Mama Rex & T: Lose a Waff
• Mama Rex & T: Run out of Tape
• Mama Rex & T: Turn off the TV
• Mama Rex & T: Stay Up Late
• Mama Rex & T: Homework Trouble
• Mama Rex & T: The (Almost) Perfect Mother's Day
• Mama Rex & T: The Horrible Play Date
• Mama Rex & T: The Sort-of-Super Snowman
• Mama Rex & T: The Prize
• Mama Rex & T: Halloween Knight
• Mama Rex & T: The Reading Champion
• Jibberwillies at Night, illustrated by Yumi Heo (2008)
• Righty and Lefty, Illustrated by Matthew Cordell (2007)

Short stories

• "Going Sentimental" in Places I Never Meant to Be: Original Stories by Censored Writers, edited by Judy Blume (1999)
• "One Hot Second" in One Hot Second: Stories about Desire, edited by Cathy Young (2002)
• "Thirteen and a Half" in Thirteen Stories That Capture the Agony and Ecstasty of Being Thirteen, edited by James Howe (2003)
• "The Crush" in Tripping Over the Lunch Lady and Other School Stories, edited by Nancy E. Mercado (2004)