That's simplifying it a bit.

[the question gives her pause, but he's been honest enough with her, she thinks.]

When we were younger, my sister used to speak about how when she grew old enough to ride a charger, she would go to fight and lead armies. She was committed to eradicating the monsters from our land, and making it safe for all of our citizens.

I know that me doing the same is what she would have wanted.