The Untimely Adventures of Mimi: Betsy Ross by Edward Bloor and Amanda Breed

When Taylor Lindstrom and her mother cheat to win the school flag-making contest, Mimi does what she does best to try to stop them. Mimi, Benjamin, and Percy travel back to Philadelphia, in 1776, to find one person who can surely make a better flag than Taylor–Betsy Ross.

Really, what could go wrong?