I thought she was about 8 or 9, surely? You're right, they must have got it wrong. I remember reading an article by Rosa Monckton, her mother, about how Diana was brilliant when Domenica was born- not shying away from mentioning Down's but not being all kind of "oh how hard for you", just practical support and help, and instant bonding with the baby. Made me feel quite kindly disposed to Diana.
That's awful hmb, I hadn't seen that, what a dreadful choice of words.