Jag kan vara felaktigt, men jag tror att det var en snygging, gjort via en artikel i Star Wars Gamer; Jag tror att hon förlorade den under en duell med Lumiya .
Redigera - Ok; hittade några detaljer via Star Wars Wiki: Per en artikel " Kejsarens panter " i Star Wars Gamer :
Under the alias Merellis, she was a Come-Up Flector for a Caprioril swoop gang. It was during that occupation that she lost the violet-colored lightsaber she had been given by Palpatine in an encounter with Lumiya. Lumiya, sent by Ysanne Isard, found her and tried to bring her back to Isard, but Jade refused. The two dueled and Jade escaped, though she lost her lightsaber in the process.
Per attribut på Wookiepedia kan mer information vara på Jedi vs. Sith: Den väsentliga handledningen till styrkan .