Welcome onboard Ben. I know you will love owning a Basenji as much as I have been these last few months. My B, Otis will be a year Jan, 4th..so we have been having a fun time with puppy hood and regular basenji behaviour..
I think they just look solid so my mind saw "bigger." I have one of the Wimaumau rescue giants (44 pounds), but even my 2 previous gals were far from petite... about 26 to 28 pounds. My dream of a petite 18 pound basenji just never happened, lol.
What a sweet face! Thank you for taking her in, she needs a forever home.
As Pat indicated, unless you have info on the parents being clear, or at least one clear, she should be tested for Fanconi asap.
Her name is Mattie and she is a real sweetie. My son brought her home from a mission trip in Appalachia. She has become my shadow and we just can't imagine not having her around.