In about 1852, this Goa'uld joined a group of six others that undertook the Trial of Ra together to gain a position in Ra's upper ranks. Together, the group made it through the first three planets of the Trial, but were unable to complete the fourth planet in time for an unknown reason, possibly being unable to find the Stargate address and password in the allotted time. Due to the nanocyites in their blood and the rules of the Trial, the group was unable to leave the planet in their current hosts without dying. Over time, the group located the spot on the back of the Sphinx's head where the address and password were hidden and did their best to erase the symbol signifying its location to strand anyone else that came through so that they could have an escape route.
In 1999, SG-1 was forced into the Trial due to the efforts of the System Lord Mat who was seeking revenge for the death of her mate Ra. Driven insane with desperation, as SG-1 crossed a wadi in the landscape, the Goa'uld attacked Colonel Jack O'Neill in a desperate attempt to take him as her new host and leave the planet. Despite O'Neill's attempts to knock her off with his MP5, the Goa'uld hung on in her desperation and insanity, strangling O'Neill.
Forcing O'Neill's jaw open, the Goa'uld symbiote chewed its way out of its host's throat, killing her and quickly flew towards O'Neill's mouth. However, before it could enter his body, Teal'c caught the symbiote in midair, the rest of SG-1 having been alerted to O'Neill's plight. As it was dragged away from O'Neill, the symbiote's tail caught him under the chin, opening a cut but otherwise not harming him. As the Goa'uld struggled in his fist, Teal'c crushed the symbiote, killing it. To make doubly sure of the Goa'uld's death, Teal'c ripped off its head and flung the two pieces of the body to the ground in disgust.
Examining the body of the host, SG-1 determined that the Goa'uld had likely been lying in wait in one of the nearby gullies for them to pass by. SG-1 realized that she must've been desperate to attack O'Neill as she did and that having failed the Trial, the Goa'uld had needed a new host body to escape the planet. Before leaving, Dr. Daniel Jackson covered the face of the host with her own shawl as he was denied the chance to bury her while the Goa'uld itself was just left on the ground in a torn, discarded heap. (SG1: "The Barque of Heaven")