@theilikepie easy because she is 6 years old and has a group. She is not directly guiding it but could be her clan/family or a third party. yet, who is the head of the group? the younger princess =p. Like a title about a flower growth. Do you talk about the soil that is actually the main and the most important ingredient for the plant to grow or only talk about the plant/flower?
Obviously, as a child she won't think about it AT LEAST this is like the fake cinderella who is a grown-up woman who reincarnated in the body of a princess that is 10 years old. I am not sure if that is the case. I can only point at the younger sister's family pulling the strings. Sorry if I went ahead and I assumed people would connect the dots and think deeper and understand what I wrote and will assume I meant to say not the 6 years old princess but a grow-up next to her. I was a bit too ahead for your understanding...
I wonder if the younger princess would be good, evil, or just another transmigrated person. I know a few stories where the MC in the story is actually kind and become friends with the new MC. Another one that the MC in the story is actually an evil person and actually was a two-faced person, another time was just someone misguided and the evil person was someone else that was always "helping her", or a transmigrated person and became twisted.
or like the new MC who came from our word came to this world but is a normal person and just want to survive. I know a manga that shows that the villainess and the heroine are from our world and end up friends. The villainess became respected and admired by her nation and the heroine was known by the people but is not admired as much as the villainess.