Background
Force-sensitivity, also known as the Sight, is rare and limited among the Chiss and usually disappears as they grow older. The Sight was Wayra'Sisa's bless and curse. She was raised by her dad after her mom died giving birth to her little sister. Wayra's dad was an officer on a Chiss fleet. At 9 years old she had a very odd dream: Her dad's fleet was attacked and all members died. The following day, overwhelmed by fear, she begged her father not to go. Startled and worried about the terror he could see in his child's eyes, he stayed back. The fleet was attacked and all the expedition members died. That was the first manifestation of the Sight.
As she became a teenager, the signs became clearer and clearer, and even though the family went into hiding she was found and taken away by the Chiss army. At 12 years old, she was trained to be a navigator for the Chiss fleet. After years navigating treacherous hyperspace routes, her ability to use the force began to faint. When her captain finally abandoned her on a planet of the Unknown Regions, she had no choice but to sell her services as a mercenary. She's been working as a spy ever since and has infiltrated the Empire to gather information on two occasions during the Galactic War.
She never saw her family again but two years ago, while she was sitting at a tavern table, she overheard Chiss soldiers talking about a young Chiss who had been killed by her captain after her ability disappeared. Her name was Tamia'Sisa, Wayra's sister.
Motivation
Wayra swore to avenge her sister who has been killed by a Chiss Captain after losing the Sight. She's been tracking him down for a long time now and finally found that he is working with the enemy. She joined the rebellion once more to take revenge.