I sold a ragdoll kitten last Monday at 14 weeks old from my litter of kittens 3 days later her eye has swollen and become infected the new owner has taken the kitten to the vet and it turns out she has herpes virus or Chlamydia virus from contact with another cat, she said he hasn't been near another cat but none of the other kittens in the litter are unwell and neither is mum and the other cat in my household. I have however offered to pay for half the vet fees.
AIBU to only offer half the vet fees and should pay the full amount
Or
AINBU and i don't need to pay any of the vet fees
No receipt or contract was given and the kitten was in good spirits and seemed healthy and she even sent me videos of her playing and jumping about in her new home
What should I do?