So nobody can pronounce on "the household", pink but it's fine for you to state as absolute fact that she will be breastfeeding 
Just to piss on your chips with that one, George and Kate were at the polo (outside - in full view of the plebs) for hours and hours when Charlotte was about 6 weeks old sans Charlotte
I am a champion expresser as I exclusively expressed for my 1 and 2 year olds for 8 months and 5 months respectively and there is no way that I could have gone that long without expressing - my tits would have exploded.
So, I think the likelihood is that she is bottle feeding or mixed feeding. Which is, of course, absolutely fine and I just want to be quite clear: I am not criticising her for that.
And, yes, I'm sure it's very tiring with her DC. I have a 1 and a 2 year old with a 13 month gap and am currently 33 weeks pregnant again. I only poor me have a cleaner to help. I think I can reliably say that I would be less tired of I had a nanny etc to also assist. That is just common sense. Not "jealousy" 