In the age of Twitter these royals have not one iota of privacy. Their every move is recorded. To a certain extent the rest of us have seen the same thing as all sorts of public records are now readily available with a few keystrokes. To another extent we do it to ourselves with Facebook, etc, etc. These days we only have any real privacy to the extent people are disinterested in us.
It might not be right, but there's no way to stop it. It's not necessarily the press - it's Twitter.
I happen to think that because there are many people who feel that the BRF is supported with taxpayer money, and that their lives are privileged just due to accident of birth/marriage (and we can go on endlessly about how they are/are not - not really the point - it's the perception rather than the reality which counts here), and because royals have no real function with the death of any concept of Divine Right - there is a feeling that we are all entitled to know her every move and she is or is not doing what we think she should/should not be doing. She must have some function in society, and we have turned her function into being little more than a circus animal - there for our amusement.
I am not saying that this is my view of her and the BRF, but as they try to carve out a purpose for themselves in 21st century life, they must take care not to help foster this view.
It's my belief that the whole concept of monarchy will end at some point in the 21st century not because they are voted out, but because it will become so untenable to live the life of a royal, that they will all opt out.