I don't see basenji in your rescue - she is a very cute doggie, and there very well may be feist in her. A DNA test would tell you everything and it's a good investment; it would help you know her personality traits and identify her behavior as well.
No idea, sometimes with mixes it's so hard to tell what the parentage is. I do think that your dog's head is a bit more refined than many of the pit mixes i've seen.
Job got some wonderful photos of your outing. Looks like all the dogs had a great time and got along, obviously all well socialized, as well as gorgeous.
We got Killian from a breeder in Ohio–-Jim Edgerton. That's where he had gotten our previous male basenji. We took Logan and Jasmine to his place and looked at several 1 year olds and a puppies and Jasmine eliminated the others and we agreed with her pick.