Jenny grins at him before he wraps her in his arms again, "I did! It took some time, but I came back. Is that what you do? What we do? ...Can we not die?" And then she pauses, a bit confused, "And what do you mean it's not a full regeneration because I look exactly the same? Am I supposed to look different?"
She's already realized that Jack is Alice's father. She wonders how it's possible, if there was a machine involved like with her own birth, but she doesn't say anything. She does, however, react when her father says that he is one of the Doctors, "Yes, what do you mean?" She takes a moment to think, "...You feel different. When I was around you before, I got this...feeling from you. It's different now. Not as strong..."