I do not agree with this!
As an owner of a birman and about to get another one next Thursday, I would not accept one that was not registered and did not have a four generation family tree.
There is in my opinion, no reason for not registering the kittens unless of course you dont have the parents history and if you dont, there is no proof they are pedigree.
I learnt last night and there is so much to learn about pedigrees and that the many of the prefixes are admin ones allocated by the Gccf, which means that the breeders do not have their own, see link
http://www.gccfcats.org/nprefix.htmlThe cat I am collecting next week falls into this category as do my birmans despite having a father who was a very famous stud.
It is impossible to enforce any contract without resorting to the legal profession and you would probably need them or a contract specialist to draw up one that could be applied.
Again the cat I am collecting falls into this category because he was supposed to be neutered and wasnt.
The real question is.................Why does she want to breed because there is no good reason if they are not registered pedigrees.
Why do people want pedigrees? In my case because the birman breed has very special characteristics both in look and in personality and the breed has a very interesting history, and any pedigree without the family history cannot be guaranteed to have these.