Grann2B
"People are saying they were in hospital with their pregnancies I do sympathise, it must have felt awful but you were PREGNANT not I'll. It will any an illness and it may feel awful and drain you but it isn't an illness and today's mums behave like it is all of them "Nearly died" giving birth these days. Never mind women have been pregnant and given birth for generations since time began."
You appear quite unforgiving and harsh in your attitude towards your DIL, and certainly seem contemptuous of "today's mums" who, I suspect, are no different from mothers all down the generations. Some are stoic, others not.
It's understandable you are upset about your friend's diagnosis and that might be colouring your perspective towards your DIL's 'whingeing' but I think you need to take a step back and examine your own attitude which comes across as being rather despotic and ruthless. It's possible your DIL was, in that moment, simply unable to comprehend the magnitude of a cancer diagnosis but latched on to the symptom of nausea and vomiting and sympathised. It was, at worst, a thoughtless comment, but you and your husband seem to now be on a crusade against her and determined not to let it go.
It doesn't bode well for your future relationship with her and if she ultimately avoids contact with you it might not really be to "punish" you but because she's made uncomfortable by your obvious scorn and contempt towards her. Only you know your DIL - we don't - but on the face of it, I think you are being unreasonably harsh and intolerant.