They retconned all of that in the novelization lol. She played flight simulator apparently

On the wreckage of a Zephra-series hauler, though, she’d once found a stash of data chips, and after painstakingly going through each and every one of them, she’d discovered three with their programs intact; one of them, to her delight, had been a flight simulator.

So when she wasn’t sleeping or just sitting and listening to the storm or tinkering at her workbench, she flew. It was a good program, or at least she imagined it was. She could select any number of ships to fly, from small repulsor-driven atmospheric craft to a wide variety of fighters, all the way up to an array of stock freighters. She could set destinations, worlds she’d never visited and never imagined she would, and scenarios, from speed runs to obsta“cle courses to system failures.”

“At first, she’d been truly horrible at it, quite literally crashing a few seconds after takeoff every time. With nothing else to do, and with a perverse sense of determination that she would not allow herself to be beaten by a machine that she herself had put together with her own hands, she learned. She learned so much that there was little the program could throw her way that would challenge her now. She’d gotten to the point where she would, quite deliberately, do everything she could think of to make things hard on herself, just to see if she could get out of it. Full-throttle atmospheric reentry with repulsor-engine failure? No sweat. Multiple hull breach deep-space engine flameout? A walk in the park.”