You can take a kid to an experience, but you can't make them remember it.|
I thought the brain underwent a period of pruning around that age (either 3 or 4)?
By the by, my great-niece remembers meeting you & Rosie--in fact, she was quite distraught that you were moving away. Her remembrance is almost certainly coupled with the trauma she experienced with her knee injury, but she remembers both of you fondly as folks who helped her knee heal/"feel better".
(Of course, it wasn't that far removed in time that you all met, but her younger memory hasn't let go of you yet.)