If she adopted the dog and their rules are they must be castrated she should comply. I've always had dogs and when I was younger before I knew better I didn't want my boys done. Fast forward to one getting ill, blood pouring from his penis due to an enlarged prostate. Vet mentioned cancer could be possible. We decided to go ahead with castration to see if that worked and after all that worry and stress it did work. I got a dog for a friend who liked the breed of dog I always have had. The breeder had one exception, he had to be castrated as her line is sought after for certain reasons and she didn't want them bred by anyone but her. The person I got him for knew this before hand but refuses to have him done as she's worried it would change his personality which I get as he's an absolutely lovely natured little boy but I'd have him done if it were me. I look after him a lot as the lady is elderly and it's the agreement when getting him due to her age he'd come to me.