It is inbreeding. But if its a recessive trait you have to do a certain amount of inbreeding. However, you also have to be VERY knowledgable on genetics too.
The cornish rex was a natural mutation. A kitten with a really curly coat showed up in a litter of barn cats in England. Because it was different, it was kept and bred back to his mother. More rexes came from that litter. But that doesn't mean you go and keep repeating it. Once you found out it was recessive, you can get other cats involved and then start back crossing a little at a time till you get consistency.
In our cornish rex club, people submitted old pedigrees so we could trace our cats back to Kallibunker. It was interesting (to say the least) on the development and how the cats connected.
In early development the breed was almost lost because there was not enough outside typey cats to add. So when a few were shipped over here, those cats were bred to siamese and orientals. My 15 yr old rex is about 10 or 12 genereations from the original (breed was started in 1950).
But dedicated breeders with knowledge of genetics were the ones that took the time to keep the breed alive.
Because its known about the letal genes of taillessness (manx) and the scottish folds ears, anyone that is breeding those cats in close inbreeding better be aware of the dangers! And also, you can't "create" a breed by mixing a bunch of cats together and keeping letal genes apart! Scottish fold people know that you don't put 2 folded together, but you still can have type. Same with manx breeds. I question too on what she thinks she is creating - its just another mixed breed cat - nothing consistant at all. And BTW rexes (cornish and devon) have a LOT of "dog-like traits" too! My son owned a 1/2 devon rex that we taught to lay down on command before he got to chase the ball and he brought it right back. A lot of my cornish are good "heelers" too
Cornish are also very sociable, people-loving cats that demand attention.
All of my cats (mixed, cornish, russian blue) also came when their name is called - that's just stupidity to think that cats ignore their names. Dogs sometimes ignore their names too