A friend told me about this but so far I've not had any luck finding it. It's about a girl who's been genetically engineered (and called an 'evo-stepper') and has a number 9 tattooed on her right arm because she belongs to the 9th series or generation of evo-steppers. She gets assigned to work on a terraforming project on a distant planet. Only she damages or sabotages it in some way and it is decided to maroon her on a nearby alien planet. It might be a 'young adult' book from the 80's. Please, does anyone know this book?