Matilda's actually silent for a moment, her head tilted downward in consideration. She's always supported that form of expression, conveying yourself through what you do and how you do it. She always turned to music and keeping her head down at the same time, conflicting elements that let the shy girl get at least some of herself across. She's still working on having that much confidence...

Don't mind her, Kuja; the small smile on her face is just her being pensive.