"subservient" my left foot.
Kate knew, just like any other person what they are marrying into. They will be aware of the strict regime of keeping lips zipped and to show a public face that is caring, helpful and happy. Most people, inc us, we do not tell everyone the ups and downs we have at home as its just not on. Kate, IMO is only doing what most other OH's in a good marriage do - IE no need to show an unhappy face in public as life is rarely a bed of roses 24/7.
IMO, HRH Kate was cut out to be a good wife, a sensible wife and a great mother just like millions of others mothers in England. This applies to the husbands as well and IMO from what I have seen, credit to them for having a good, strong marriage.
Ill health puts a worrying starin on the family and this is where we are with Kate/William. IMO, they have been let down by KP