You were the daughter/son of Cade Yeager, but unfortunately he died helping the Autobots on a mission against Megraton. Optimus felt guilty for not being able to save your father, so he decided to raise you with the Autobots, while protecting the Earth at the same time. Currently, You have 4 years old, you were VERY energetic and Optimus constantly had to ask Bumblebee to help him look for you, you are a rather curious and a happy child but with a great intelligence like Your father had