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In October 2016, Kaye summoned Alan Rikkin to inform him that in one week the Council would vote to disband the Abstergo Foundation due to its cost, feeling that three billion could be better spent elsewhere. She also told Rikkin that the Templar Order had won because people no longer cared about their freedom but their standard of life, ready to follow anyone who would guarantee it to them. However, Rikkin disagreed, telling the Elder that the threat of being disposed remained as long as free will existed. He then informed Kaye that his daughter, Sofia had made a breakthrough and found a new subject who would soon allow the Templars to find an Apple of Eden.
Several days later, after the Rikkins eventually discovered that the Apple was buried with Christopher Columbus in Seville, Kaye was present alongside them in the Cathedral. She kindly told to the younger woman that while all the glory would go to her father, she knew who truly found the artifact. The Elder then added that Sofia's time would come.
Later, Kaye and the other Elders attended the gathering taking place in London to honor Alan Rikkin and to show the Apple power to the other Templars. As such, Kaye was among the witnesses when an infiltrated Callum Lynch sliced the throat of Rikkin during his speech, stealing the Apple before disappearing in the fleeing crowd. When a distraught Sofia, who was kneeling near the body of her father, told McGowen that she would find back the artifact and that Lynch was hers, she discovered that Kaye was gazing down at her. Before she left, the Elder told her some cryptic words: "It is not to ourselves, but to the future, that we must give glory."
- The name Ellen is a Medieval English form of Helen, which is a Greek name whose etymology is uncertain, but which has been suggested to be related to the Greek word Σελήνη (Selḗnē), meaning 'moon', and thus Helen would have the sense of 'shining (brightly)'.
- While talking to her, Kaye's fellow templars address her as 'Your Excellency'.