
Originally Posted by
Moomba33
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It is a side of her you could only see in Binding Coil story due to more interaction with her.
SPOILERS
before binding coil story ending she was a bit stubbern and tried to take on the burden to save the world by herself and only ask the WoL for help because she believe WoL was the only one capable of helping her. If Alphinaud was not there at the FInal Coil she would have gotten herself killed due to her own stubberness to carry the burden of their grandfather alone. Basically being the opposite of what her brother did through the 2.X Main Scenario who tried to save the world by uniting people together.
Of course both siblings learn their methods to achieve their goals were wrong in the end of their story.