I don't actually take issue with the amount spent on her clothes - obviously she's a senior Royal so has to dress for that status.
However the very low number of engagements she undertakes, in my opinion, are not acceptable. I don't get the argument that she has three young children and that is why she can't do much - she is privileged to have a massive amount of help, and the children are all in school now. I just get the feeling she loves all the perks but doesn't understand the concept of noblesse oblige.
Time will tell I guess, but if the monarchy want to remain relevant after this particular generation are gone, then they'll need to modernise and up their game.