I would be very cautious if you do not want to end up with a cavalier with the same problems.
Most of Kaytees health issues are inherited problems and could have been passed down to her descendants.
You would be wise to ask this breeder if she has had the mother health checked for heart and SM? Was the father health checked? Can she show you the certificates for both parents?
I have a list which will explain the certificates and how to read them. Send me an PM if you want a copy.
If the parents have not tested then I would be very worried, considering the problems that are behind the mother of the puppies, and I would question whether this is a breeder that is responsible and caring about the puppies she has bred.
Please think before you buy, even though I can understand how appealing it is to think of owning Kaytee's great grandchild.
If you buy from someone that does not health test, and proves it by showing the certificates, then you will be encouraging her not to bother about making cavaliers a healthier breed.
If you are going to buy another cavalier please buy from someone that cares about their welfare, and make it worth their while to pay out for the health tests.
Cavaliers......Faith, The Ginger Tank and Woody.
Japanese Chins.... Dandy, Benny, Bridgette and Hana.
Remembered with love......... Tommy Tuppence and Fonzi