The whole "linked, not ranked" thing was 100% about not wanting to acknowledge that Kate outranked her. As was the whole "his grandmother" and "his father" and "your brother" thing, rather than ever, once, the Queen, the King etc. She has always referred to them by their relationships to her to bring them all down to the same level as her - she can't say the words (hence the mock curtsey on Netflix, also). On the one hand, who can blame her - the hierarchy is beyond anachronistic and they're all ridiculous. But, she did choose to marry into it. Pick a side, lady.
I completely agree @Raincloudsonasunnyday.
It boils down to what on earth did she think a hierarchal monarchy was? Did she think that W&K would choose to step down and she could become a Queen?
There seems to have been an utter misunderstanding of the role of the monarchy. And again, this HAS to come back to Harry not explaining it properly.
But then the idea of a self proclaimed campaigning feminist choosing to give her entire life to her husband, living in a foreign country, never having a say in what she did/where she went or being able to ever make a public opinion again for the rest of her life always seemed weird. The juxtaposition was insane.
I've always stated that I never blamed her for finding it hard to fit in. Anyone would struggle to fit into the confines of a royal family without being born into that aristocratic world. Every single one of us on this board would find it hugely challenging to deal with. So I've never ever blamed her for walking away and saying she couldn't cope anymore.
But her actions and behaviour after that? Absolutely her fault.