Brooks was a member of the group called "The Trust", which was comprised of rogue former NID agents, who believed that they had the right to use any means necessary in order to protect Earth.
Biography
2004
When Krista James killed Doug McNair in self-defense, she, Jennings and Hoskins framed Teal'c for the murder and kidnapped Krista. They then blackmailed Dr. Daniel Jackson into translating an Ancient text for Osiris' Al'kesh that was left in Earth orbit. (SG1: "Chimera", "Affinity")
She and The Trust paid Dr. Hugh Bricksdale to use Osiris' Kara kesh to get onto Osiris' Al'kesh. They used the Asgard transporter to steal the Stargate and employed it to launch symbiote poison attacks on several Goa'uld worlds. When Stargate Command began investigating the disappearance of the Gate, they questioned Bricksdale and he set up a meeting with Hoskins. They ambushed him, and he was shot with a Zat'nik'tel by Lt. Colonel Samantha Carter, who used his locator beacon to beam up to the ship. She beamed to Hoskins' location and beamed him to the ship. When Dr. Daniel Jackson convinced Bricksdale to use the Kara kesh to beam him to the ship, Hoskins shot him with a Zat, but only after Jackson had deactivated the cloak. When Teal'c dialed into the Gate, Brooks lost contact with the cargo bay and was unable to get the cloak back online and activated the hyperdrive. (SG1: "Endgame")
Her fate is unknown, but she may have been killed when the Prometheus destroyed the Trust's Alkesh. (SG1: "Full Alert")