I would ask the breeder why she is breeding an affected bitch. I would also ask if the dam is currently being tested at least monthly for glucose in the urine. She will be four years old in December and could be. If she is, I would ask if she is on the Fanconi protocol and why she would breed a dog that is. I would worry about her receiving enough nutrients, especially calcium for both her and the unborn pups, considering that Fanconi affecteds urinate nutrients and must be supplemented.
I have a Fanconi affected at home and it can be difficult in keeping normal values of nutrients. My girl's recent test showed a just below normal level of potassium. About a year ago, I had to increase it and will have to do so again.
If you have not read the Fanconi Protocol, I highly suggest you do so you will know what needs to be done to keep a Fanconi affected dog healthy. Here it is: