Healthy young basenjis are hard to find homes for. I am not certain how your parents imagine they can find a "home" for a blind dog that is incontinent. If she is not a mix, it is possible a rescue might take her, but honestly, she is not very placeable at this point.
Has the vet checked her for other issues that could be causing the incontinence? Sometimes spayed dogs do have issues. Have you tried removing water at least 3 hrs before bedtime? Has she been tested for Fanconi or diabetes or any other health issue?
Where did you get her from? If you know who bred her, they may be of some help or we can at least check for any health clearances.