You got a good point there and I'll take it a step further.
Harry has a childhood trauma he never recovered from, he lost his mother in a horrific traffic accident caused by a car chase, a careless driver and not using seatbelts. All at an early age where he was not mature enough to comprehend people close to you can die but old enough to read and see all mentions on her passing as well as his parent's private lives being exposed. And. to make it worst for Harry, with a family that avoids showing strong emotions of grief in private and in public. That year marked his life, rebelliousness and poor decisions later on.
Meghan also has a life of trauma. She was spoiled by her father, which happens on persons that become parents again at an advanced age when they already had grown children. Being spoiled turned into ambitions like wanting to be the center of attention and becoming a big star. Years went by and her most successful career move was being part of an ensemble actors TV show most people in the USA have never heard of.
Her trauma? she achieved this at what sexist and ageist Hollywood considers to be late in the game age. She found another path to reinvent herself by finding Harry come to her rescue from a TV show heading for cancelation.
But, like Harry, there's trauma still. For me, as an observer, that trauma seems rooted on being unable to achieve her goals to become a A-List star on her own. I suspect that still resonates in her head. You take Harry out of that equation and today Meghan would be a footnote mention in one of those Entertainment TV
"where are they now?" filler articles.
That's how I would explain her current
minus-Harry moves around the party scene, she wants to be what her father made her believe, the most special person on the planet. Problem is she converted a parent's love into an
everyone-has-to-love-me personality and it's just not going as expected.
Like on her TV show, she went from one ensemble cast team on Cable TV as a supporting actress to another ensemble cast upon marriage, the Royal Family, as a supporting royal. And as
@Healthy Sceptic pointed out
sometimes your personality gets stuck at the time a huge trauma happens but in the duchess' case the trigger was her expectations exceeded the
reality around her.