Sidori's story began with a tragedy. Her memories about past starts from a brutal abduction by Sansha Nation from the planet which name she couldn't even remember. In seconds after the assault began she were captured and put in some kind of a device. At the time she were piloting her ship as a Nation's Capsuleer she was sure in the paths and ways of Nation. Soon the incursions began she used violet wormhole but something went wrong.
She ended up flying without control in Anoikis. Most of the Sansha's enhancements implants were fried. Now she was in even more horrifying situation. If she self destructs she would be returned to sansha's station to reimplanted clone without her own will again. But she didn't even had a prob launcher. Days passed and when she was ready to return to slavery by destructing her POD another capsuleer showed up and saved her.
So she became a vessel of this capsuleer's will, first decision made by her new, maybe twisted, but own personality.