This story begins during the episode: "Dog Tags" Gibbs has just exited the elevator from Visiting with Abby. As he steps out, he sees Ducky approach Jenny at the base of the stairs ascending to MTAC.
"If you have a moment, I'd like to go up to your office and discuss this with you."
Gibbs watched as Ducky and Director Shepard walked up the stairs to her office, clipboard in hand. He wished he knew what was on that clipboard. He needed to know. He needed to be on top of the health of all of his agents, above and below him. But this was different. It was personal. It was Jen.
Up in the Director's office, Jen knew what Ducky was going to tell her. She didn't need to listen. She couldn't take her mind off the way Gibbs had stared at her. He was staring into her soul. He knew. He had to know. Why else would he look at her like that? "No!" She thought. He couldn't be sure of it. There must still be doubt in his mind. And he was not going to get confirmation. She had to keep this from him; from everyone.
"As you can see, Director Shepard, these tests to not prove much. In order to avoid suspicion from Abigail, I did not have her run the series of tests which will narrow down exactly what is causing your blood to show high levels of Creatine Kinase. I'm afraid, because symptoms could take at best, several years to appear, the only way to determine exactly what is conspiring inside of you, is to bring Abigail in on what is going on."
Ducky paused to study the look on her face. He couldn't tell exactly what she was thinking; only that she was hiding something. It wasn't going to take years for her symptoms to appear, he was an optimist. She knew something wasn't right, why else had she come to him? Choosing his words carefully, he began again, "Director, why exactly did you have me run these tests?"
Jenny could say nothing. It was obvious he was trying to reassure her, by giving her the best case scenario. But deep down, she knew, there was no best case scenario. This disease inside of her had been poking its face around for some time now. She wasn't even sure how long she had been ignoring the signs.
Her silence was Ducky's answer. "How long Director?"
She sucked in her bottom lip, and shook her head. "I don't even know." She couldn't bring herself to make eye contact with the concerned Doctor.
Ducky sat back in the chair he was seated in, and exhaled long, and slow. Then he unpursed his lips, and looked back at the Director. "I need for you to tell me everything."