Lost

1954

A 17-year old Hostile in 1954, Eloise (under the name of "Ellie") was likely involved in the flaming arrow attack against the survivors during one of the Island's time shifts. ("The Lie")

Subsequently, Eloise commanded a small squad which ambushed and captured Daniel Faraday, Miles Straume, and Charlotte Lewis (members of the science team). She first assumed that they were members of the U.S. Army, despite their claims that they were scientists.

She led the captives back to the Hostiles' camp where she left them in the care of her leader, Richard Alpert. Alpert appeared to trust Eloise and later asked her to single-handedly escort Faraday to the Jughead so that he could disable it. Along the way, Faraday remarked that Eloise looked like someone he used to know. She however expressed great distrust for Faraday and wanted to know exactly what he was doing, at times threatening to shoot him. He eventually confessed that he was from the future, but before she could extract any more information from him, she was ambushed by Sawyer and Juliet. Sawyer held her at gunpoint and forced her to drop her weapon. However, before the confrontation progressed, a time shift occurred and Faraday, Juliet, and Sawyer vanished.

1977

After Sawyer and Kate brought the young Ben to Richard Alpert, one of the Hostiles told Richard he shouldn't save Ben without asking Ellie first, and warned him about what would happen if Charles found out. This implied that Eloise and Widmore were in positions of leadership at the time. Richard replies that he doesn't answer to them, implying that he is independent of their authority. ("Whatever Happened, Happened")

Several days later, Eloise was present at the Hostiles's camp when a man stormed in, waving a gun and asking to see her. Richard came to Eloise's rescue, telling the man that Eloise was not present at the camp at the time. The man instead threatened to shoot Richard unless he was taken to Eloise. Before the man could act, Eloise, who was actually present in the camp, took aim and shot the man in the abdomen. As the man fell, he realized that he had been shot by Eloise, and whispered to her that she had "known it the whole time." Confused, she asked him who he was, and he revealed that he was her son, leaving her standing over him, shocked.

Eloise then skipped through the pages of Daniel's journal and was confused by the dedication in it, which she appeared to recognize as her own handwriting. When Charles Widmore arrived with Jack and Kate as captives, she ordered that they be taken to her tent. She assured them she'd believe whatever they said because she just killed her future son, the same man who told her to bury the bomb 23 years earlier before disappearing. Jack told Eloise that by using the bomb, they could alter the future and undo what Eloise had done to her future son. Eloise agreed to help them and with Richard and Erik, they went to the bomb. They arrived at the creek where the entrance to the Tunnels was and after a run-in with Sayid, Richard, Jack, Eloise and Sayid swam down to the underground tunnels beneath the Barracks where the bomb was hidden. They came to a room and Eloise uncovered the bomb.

Intent on helping Jack and Sayid, she assists in disassembling the bomb to extract the nuclear core, the only part necessary. Richard objects to her messing with radiation because she is pregnant. She ignores his warning and helps. They then travel through the tunnels to a spot where Richard bangs on the wall of the tunnel with a sledge hammer. He breaks through the wall to reveal the basement of what we find out to be Horace's house at the barracks. Eloise insists on leading the group through The Barracks but is knocked out from behind by Richard. He states that he must protect their leader, referring to Eloise. He also says they have received sufficient help and must now continue alone. ("The Incident, Parts 1 & 2")

At a later date, under unknown circumstances, Eloise left the Island and moved to Essex, Massachusetts, where she raised her son Daniel Faraday, fully aware that he would die at her hands after traveling back to the 1970s.