I think people like to paint public figures as good or bad (pantomime figures, often) and aren't prepared to consider most people are just humans, with good points and bad points, strengths and weaknesses. I am interested in the story of Meghan and Harry because I think it contains a lot of fascinating conflicts.
At heart I've often thought a large part of the difficulty Meghan faced was cultural - she just didn't get how different things would be, and seems to have viewed advice as opposition, which made her annoyed. As an example of this I offer what's just been published as yet another extract from Finding Freedom in People - pap shots of her taken in December 2016, a month or so after the news of her and Harry's relationship broke. She was carrying a bunch of colourful flowers and wearing a necklace with an "H" and "M" on it, smiling broadly at the camera. The photographer who took the shots is on twitter and has confirmed the photos were arranged, she was very accommodating to ensure the shots were good, and the necklace was from one of her friend's jewellery brand, who made a lot of money from the publicity. In other words, this was exactly what Meghan had wanted - she was directly raising her profile off the back of the relationship. Then, as the book reports, she was contacted by the palace who obviously assumed the photos were unwanted, and advised her that wearing eye-catching jewellery like that would only encourage attention, which she found frustrating and upsetting.
I mean, it's a storm in a teacup really, but shows how she and the palace staff were clearly not not the same page at all in relation to their expectations right from the get go. Better communication on all sides would clearly have helped, but given what happened subsequently I don't think she wanted to toe the line, or be told what to do. Which is, fine, and her choice, but...why on earth would you take on the job? And if she is making it clear to the staff that she is not interested in listening to them, it's not difficult to understand that they found her difficult.