[There’s a certainty to the statement that she wants to question. Almost doesn’t, as the hand writhes. But—]
What makes you so sure?
[It’s not “I don’t think you will.”]
Other options:
no subject
[There’s a certainty to the statement that she wants to question. Almost doesn’t, as the hand writhes. But—]
What makes you so sure?
[It’s not “I don’t think you will.”]