Jenny's voice gets quieter, "How? How do you know the Doctor?" Before, she had thought she was going to be introducing this Time Lord to her dads. But this makes more sense. This is about revenge. Vengeance of some sort. And she had walked right into the Master's twisted plot, had given him the bargaining chip he probably hadn't even been looking for.
She has to get out of here, she has to warn her dads. She has complete confidence in them, but she doesn't want them walking into a trap all the same. Not because of her stupid mistake.
"And is that what the point of all this is? To make the Doctor see the big picture? To make him understand what's happening with the Rift?" Jenny can't keep the smart comment to herself, "What, you couldn't have sent him a letter or something?"