Readers who enjoy flawed but outspoken characters like Parks' Junie B. Jones or Giff's Hollis Woods will appreciate Susie's misguided exuberance. She has very decided opinions about her classmates, thinking that some are "fake" and others get lots of advantages just because they turn in work on time and behave in class. Susie also struggles with her older brother, Lock, who is very bright at school and doesn't irritate their parents. Her parents are rather long suffering, but try their best to understand her.
Like many stories aimed at elementary readers, this includes lots of details about classroom activities and projects, and the dynamics between students as well as with various teachers. Susie starts the book with very clear ideas about what her classmates are like, but does change her opinions once she learns more about them.
Information about Susan B. Anthony, including discussions of her beliefs that are now problematic, will interest readers who like biographies and histories. Steve Jobs gets his share of information included as well. My school has certainly done biography projects before, and I haven't seen anything in middle grade fiction that addresses the idea that "heroes" might not automatically be perfect. This is a great concept to introduce.
Fifth grade is a pivotal time, as shown in books from DeClements' Nothing's Fair in the Fifth Grade (1981) to Winston's President of the Whole Fifth Grade (2010) to Shovan's The Last Fifth Grade of Emerson Elementary (2018). Friendships realign, identities emerge, and boundaries are pushed. Young readers who are trying to navigate this difficult terrain will find it interesting to go along with Susie B. on her fifth grade ride.