Sadelli was a Twi'lek woman forced into slavery. Living on the world of Tatooine amidst the Galactic Civil War, she was the elder sibling of Soolami.
In the year 1 ABY, Sadelli was enslaved by Trandoshan slave owner Woff B'tar. She managed to flee captivity before being transported to Nal Hutta, yet she remained in severe peril. Luckily, JillJoo Jab, a waitress, sent a spacer to locate her and return her to Mos Espa, with the goal of ensuring her safe passage off Tatooine.
Although the spacer successfully escorted her, she refused to depart the planet without her younger sister Soolami, who was still held captive. JillJoo once more sent the spacer, this time with the mission of rescuing Soolami, allowing both sisters to escape the planet together.
Sadelli appears as a Non-Player Character (NPC) within the MMORPG Star Wars Galaxies. Players engaging in a sequence of missions for JillJoo Jab in Mos Espa are tasked with locating Sadelli and ensuring her secure return to the city.