
If her kc reg has the endorsement 'progeny not for registration ' then yes you will have to speak to your breeder to have this lifted before you breed.
What did your contract say? Normally breeders use this endorsement to ensure an owner completes the recommended health testing for the breed and that the dog has no issue that means it shouldn't be bred.
For your breed the health testing would be Hip Scoring, Eye Testing and DNA testing for PLA, AMS, FN, AON and pdrd-PRA