(I have another response.)
Lean away, give her a long look, and gaze deep into her eyes. Tilt your head slightly to the side.

“…. dad?”

In the stunned silence, because she never expected you to be right, tell her that you didn’t think you would see her again after she disappeared on her way to get cigarettes all those years ago.

And then put your hand on her thigh and say “I’ve missed you daddy” with wide eyes.

Gets ‘em every time.