
I show my Jack Russell Terriers in Ireland as they are all registered in IKC (stupid england dosen't register the breed, now the only country that dosen't as AKC now does!).
A puppy can only get promising or very promising there is no excellent for puppies under 9 months of age.
The puppy being awarded VP should have been awarded the green star if it beat the other bitches, if the pup was good enough for a VP grade & to beat an older bitch then i don't see why the judge didn't award her the GS' to say she isn't mature enough is not IMO good enough reason, we see lots of breeds taking CC tickets in the UK as pups.
A JRT bitch pup got VP in her class recently & then took bitch green star & BOB over a champion import male, the bitch had glaring obvious faults though (roach back/flying ears) so i was surprised to see the judge award her GS & BOB.
Have you lodged your concerns with IKC? i would if i was you.