That's sorta the thing that is and isn't about her. She is a kinda pampered, impulsive hothead early but slooooooooooooooowly gets stronger during FC. It looks like Cassius is going too far by both sheltering yet fast-tracking his daughter, yet the apple didn't fall far from the tree so it both by nepotism and natural skill works out for her. Then she gets the tears and immaturity out of her system in SC to hit Beast Mode, all lengths of hickory upside people's heads and snark for days.
It's one of the reasons I'm hungering for 3rd and Azure (and beyond) as I've heard Estelle and Joshua are in those. Seeing that heroes' growth continue would be aces.
One of the things I like about this is kids don't fall ass-backwards into safety but occasionally, but they also ain't like most JRPGs and "LOL ADULTS SO DUMB KID POWRRRRRR". They are definately in the shadows of giants, for now. That goes for Estelle, and for now as far as I can see, Rean and co. too.