Again that is great that you don't have to worry about Fanconi and that super
… but only goes to show that it is so important to test.... I (sorry) don't remember where you got your Basenjis... but I am guessing the sire and dam's were not tested... so the Sire and Dam of your girl, one will be a carrier at best and one clear, or both can be carrier, or one could be affected and one carrier. Hopefully you will let the breeder know that they need to test before breeding again... as there is every chance that they could be producing affecteds.
Even your boy could have a carrier parent... and be clear or worse both parents could be carriers and have a clear...
Or you could have bred your girl to a carrier and produced affecteds....