The Samaritan woman exaggerates to show that she is impressed by how much Jesus knows about her. Alternate translation: "Come see a man who knows very much about me, even though I have never met him before" (See: [[rc://en/ta/man/translate/figs-hyperbole]])
The woman is not sure that Jesus is the Christ, so she asks a question that expects "no" for an answer, but she also asks a question instead of making a statement because she wants the people to decide for themselves.