Nothing out of his mouth is what Gabrielle had come to expect from the man a good chunk of the Wizarding World regarded as cold and terrible. She had difficulty hiding the confusion from her eyes; it mingled with skepticism and lingering fear for her situation- especially when he asked his question.
She knew exactly why she ended up here- in the Disciple program, at least- but any ideas she'd formed about why Malfoy specifically requested her felt too dangerous to admit out loud. That's part of why she was still terrified.
"I..." she stammered a bit, her thin fingers curling in a bit on her lap, as if she were trying to find purchase; to hold onto something. "I 'aven't allowed myself to wonder, monsieur."