In the second issue of the Rogue One comic book adaptation, there is a flashback scene of Saw Gerrera and Bail Organa arguing over a holotable. The whatever event must have taken place before Gerrera abandoned Jyn, around 5 BBY.
In the image, young Jyn Erso was standing next to Gerrera, and little princess Leia stood on the opposite side. As the girls were almost the same age (only two years apart), both surrounded only by grown-up rebels, they might have had some interest to interact with each other. Do we know if the two young ladies were actually acquainted?