
The breeders and others like here will continue on their merry way while it is profitable for them to do so.
With dumb luck a lot of the pups she breeds will be reasonably OK, some owners won't relate any future problems (going blind when older etc) to poor breeding.
The only way to stop bad breeding is for people to refuse to buy badly bred pups.
If all potential owners insisted on KC registration, proof of relevant health tests etc this person would have to do so or be unable to sell her pups.
As it is people are more than happy to buy, and when one turns out badly soon after sale she refunds the price and goes along on her own sweet way, as the owners an pups long term welfare is not her concern, getting a high price with the least outlay is. £700 for a poorly bred unregistered pup.
In my breed we Hip score, eye testing, DNA test and Kidney function test, often very long distances to travel for studs (including abroad), stud fees are the price of a puppy, yet pups in the breed are only around £650.
For that you get a breeder with lifelong commitment to the pups they breed who can be contacted for advice all along, and if the worst happens will be there to help re-home.