Mind Guest (Daw Book Collectors)

Diana finds herself on a disabled space ship, where she'd been put while unconscious by the slaver she'd been after. The man wanted to be able to say she was alive and well the last time he saw her, and as far as he knows she's still the same.
Diana has nothing but death to look forward to, having been headed out of the area of space of her Federation. Instead of waiting, though, she tries to repair the damage done to the ship. Instead of the effort working, though, she makes things worse. Just as the end is coming she's rescued, but not by her own people...