"When Gibbs visits Jenny in the forth season finale, she mentions that he should have called first and that people in polite society do, Gibbs mentions that he has broken down to many doors to be polite anymore, Jenny responds with and thank you for using the bell that she has grown rather fond of the front door since she was a child.
I think that this was a bit of foretelling, that she was going to die she knew, she was sick, but that the house had to die with her was something that told that mare was going to happen, something that would be a little more than her dying of a terminal illness. We are told about her death before it happened. "