she decided to go along for the ride, and about 3 days later, a freak accident or an attack (it's unclear) severly damaged the ship, and killed everyone on board except Annabelle, who managed to "land" safely.
She was living her life on COLD-1, a pacifist planet, when she used a knife to carve something into an I.C.E-wood post, she was kicked out of her town, but she found The Stardust, the biggest colony ship the humans had ever built,
Here's how Annabelle came to end up on COPPER-9:
Annabelle: *Humming a little sing as she works*