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Here are two articles found in our YT library that might help you to clarify your thinking on this subject. And it is refreshing to hear you are doing your research first!
Breeding is not for the "faint of heart" for sure. The emotional cost is very high, particularly if your bitch has problems, young newborns die after doing all you can for that wee soul. There is no preparation for the pain you will experience, all you can do is your ultimate best to insure a safe, healthy whelp and puppy rearing. And all you can do covers a whole lot of territory, as the above articles reference.
Are you a member of the Yorkshire Terrier Breed club in England? If not, why not? You are thinking of breeding, therefor go to the breeder experts who are members of this club.
The breeder who sold you this gal; did they do so with the understanding you "might like to breed her'? At six months old she is just ready to be evaluated by judges and breed experts to see if she is worthy of being bred.
Have you done the preliminary health screening, which at this point would include BATS. Also does your current vet think she is clear of LP? There are many more tests to come; some of which can not be done until she is at least 2 yrs old. I do know England doesn't have the expanse of health registries we have in NOrth America, but IMO you need to breed healthy to healthy at the minimum. And their is the health lineage to consider as well.
Show breeders will tell you that there is no reason to breed other than to improve the breed!
If you want to know about the health problems of Yorkies just go to our Sick and Emergency Forum to educate yourself.
As a breeder when you sell your puppies to future buyers, are you prepared to support that buyer over the lifetime of your puppy? What happens when one of your puppies gets ill after being in their new home for only a few weeks. It is a congenital heart, or hip, or liver condition.