Background
Valla was raised on Ryloth during the Clone Wars. She was however blessed and did not have to witness most of it. Her luck turned however as the Jedi Purge happened. Her village hid for many years a Jedi. But eventually the Empire and their Inquisitors came. Valla witnessed her friends family tortured endlessly for the location of the Jedi. Eventually the jedi was found, and the Twi'Lek were sold to Hutts. Valla eventually became a slave dancer for an infamous Hutt.
These years were about as traumatic as the times during the purge. Valla would however not let this break her. She managed to detonate several explosives in the Hutt's cruiser and take off in one of the ships. Repainted and renamed "The Unchained Wildcat" this ship would become a symbol of the freedom she claimed and therefore mean a whole lot to her. Now she has for the past years trained herself in the arts of smuggling and piloting to make a living.
Motivation
Emancipation: The character sees slavery and indentured servitude as an abomination that must be undone. She'll go out of her way to aid or attempt to free anyone kept in slavery.