Born and raised in a Temple on Jebanna, she was taken by the System Lord Marduk to serve as a host for one of his underlings. Her training in the Temple allowed her some influence over her symbiote, and convinced it to go to Cimmeria. Taken by Thor's Hammer, she convinced it to go to the Hall of Mjolnir, where it killed her. Grateful to Thor for placing the hammer there, she remained on Cimmeria. She helped heal people with a Goa'uld healing device that she retained along with a kara kesh from her time as a Goa'uld host. As a former host, she possessed the ability to use the technology, but it took her years to master it.
When SG-1 came to Cimmeria, Colonel Jack O'Neill and Teal'c became trapped in the Labyrinth. Dr. Daniel Jackson and Captain Samantha Carter sought her help. Though reluctant to help a Jaffa and revisit the Labyrinth, she helped guide them there, where Teal'c was freed when Daniel fired Teal'c's staff weapon at the Hall. (SG1: "Thor's Hammer")
Later, when Heru'ur arrived to take Cimmeria by force, Kendra realized the threat, and urged Gairwyn to send the Sagan Institute Box to Midgard. Kendra was eventually killed by Heru'ur's Horus Guards. Her kara kesh and Goa'uld healing device were taken to Earth after Captain Samantha Carter discovered she possessed the ability to use them as she was briefly a host to the Tok'ra Jolinar of Malkshur (since for all their ideological differences, Tok'ra and Goa'uld symbiotes are physiologically the same species). (SG1: "Thor's Chariot")