The Matilda Effect by Ellie Irving (2017)
Matilda, the plucky protagonist from The Matilda Effect wants to be a famous inventor, so she enters the school science fair. Despite her excellent invention, she doesn’t win, all because the judges didn’t believe she came up with the entry by herself. Because she’s a girl. Dejected, Matilda discovers something similar is happening to her Grandma, an astrophysicist, whose discovery of a new planet is about to win a Nobel Prize – only to be claimed by somebody else! It’s a race against time to crash the award ceremony and reveal the truth. Will they make it?