When the perfect home for your puppy turns into breeders nightmare

The story of a beautiful male I love so much 

Every puppy I bring in to this world is with careful planning and when they leave my home I trust them to owner who will love them like I do and give them the best home possible. Most important of all that they love them for whom they are not what they could be! 

Brother of Conrad, Cameron, was sold to an owner in Sweden. She wanted a show dog and I gave her the most promising puppy of the litter. All breeders know we can not guarantee that the dog will be a BIS winner at the age of 2 months, when they go to new homes. But we see a prospect or then not.

As a breeder I have met Cameron's buyer half way any time it was asked for it - with keeping him longer here than normal, with payment terms etc. I have offered any sort of help any breeder can do. 

Cameron grew well, but suddenly, at the age of 1.5 years, started to limp seriously. I advised the owner to take care of the dog, what to do, which specialists to consult etc. She replied that they had done a 10 km walk... I tried to explain again how to keep the dog, but as she has had dogs for long, she did not listen.

At almost 2 years, this dog was diagnosed with hip dysplasia which is severe. I offered to purchase the dog back, as it was clearly not going to be of use to this person as show dog. She refused and kept on naming me in the internet and calling me a bad breeder. Today I learned that after I published problems in D litter with patella, she has decided that her dog has that too and again keeps implying me a as irresponsible breeder...

I have never gotten any documental proof of Cameron's problems and I read constantly complaints about him in internet. 

I am sorry, but if a person has done everything against my advise thinking they know better, then I do not feel responsible for misdoings of her. I am still prepared to take the dog back on the same conditions it was originally sold on, but she is not interested in that too. Every time the litter mates of her dog win somewhere, she complains of her dog's ill health and my irresponsibility. So I have nothing else to say to her, but say it in public - I do take responsibility of each dog I have bred. But I also request a person to be honest and follow the guidelines I give them. Cameron is always welcome back in our house as any of my puppies are.