Your insistence that Meghan is ready and prepared, and needs no help or guidance...
I never said that though. Those are your words and your exaggeration. I said Meghan, according to all reports and evidence is smart, confident, a fast-learner, and a hard worker. Not many people could accomplish all that she has with such apparent ease, in such a short time. It seems to me from all I've read about Meghan and witnessed, that she learns from her experiences and her mistakes, and she applies what she learns.
Meghan once told the story of going on an unsuccessful audition, after which the casting director advised her:
"You are enough." Meaning that she didn't need to overdo it, or try too hard to be more than who she was as an actor. Meghan took that advice to heart and she passed it on to fans of her former blog.
... an adult with a huge learning curve ahead of her. Just the tours and engagements she has done so far would have required hours and hours of behind the scenes listening and learning to simply get up to a minimum level. Royalty need to understand the local issue, the history, and the hot spots. Unless times have changed dramatically I am fairly sure students in California do not spend a great deal of time, if any, learning the history of the British Empire
You seem to be ignoring the fact that Meghan began learning during her courtship with Harry, as much as she could about the royal institution and what would be required of her. And as soon as they became engaged, both Harry and Meghan set about traveling to various locales around the U.K., so Meghan could become more familiar with her new country. It was Meghan who had the idea of going on these local trips to meet people and to learn about different community projects. M&H managed to do this even while they were taking on the enormous task of planning their wedding.
You must have missed the fact that Meghan is said to be learning from Prince Charles about the history of the British monarchy, and about the Royal Art Collection, because she asked to be taught. Surely Meghan is still learning, as we all should be open to learning every day of our lives. But why the insistence upon dismissing Meghan's obvious competence and calm grace? The South Pacific tour was a huge success, as was the Sussexes' three day visit to Morocco at the end of February when Meghan was in the latter stages of her first pregnancy.
The other part of this is, Meghan was already world-traveled, successful, wealthy, and articulate before she met Prince Harry. She studied theater and international relations at one of the most prestigious schools in the U.S., Northwestern University in Chicago, Illinois. During her senior year in college, Meghan interned at the U.S. embassy in Buenos Aires, Argentina. Meghan also lived for seven years in one of the most cosmopolitan cities in the world, Toronto, Canada. She had already traveled to New Zealand on vacation, as well as to Greece, Norway, Mexico and Spain, and probably to other locales I'm not aware of. I know Meghan did some filming for Hallmark in Vancouver during down time on
Suits.
Meghan also spent a lot of time in New York and London over her seven years of acting on the television series,
Suits. Her acting experience, which involves the seriously exhaustive task of learning lines, is not a small thing. I'm sure that's one of the reasons why Meghan is such a skilled public speaker. She reportedly writes her own speeches, and she's helped Harry with his speeches too. Meghan is not a perfect person, but she is certainly a very accomplished young woman who knows her own mind, and has made the most of her experiences and opportunities in life. She is also a person who expresses gratitude for her blessings. She clearly enjoys sharing with others and giving back:
https://www.youtube.com/watch?v=G6llUEn9678
https://www.youtube.com/watch?v=QQsq8J2c4w0
There is so much for Meghan to learn! That she is willing to take that on is not a sign of weakness, but a sign of strength and respect for the institution she has married into.
Look at the engagement interview. I linked it earlier. If you haven't seen it, Meghan spoke eloquently about her respect for the institution, and expressed how honored she felt in being accepted as part of not only the royal firm, but also the royal family. I have no idea what you are trying to suggest by implying that Meghan hasn't already taken on a huge amount, and shown amazing strength and fortitude, especially in the midst of being torn down by Markle family members and gnarly ever-dissatisfied critics and trolls.
Perhaps you are imagining how hard taking all of this on would be for yourself. None of us have much of an inkling about what it's truly like to be a member of the British royal family. Meghan does, and then some. It's silly to suggest otherwise.
Did you even read the earlier
Vanity Fair article I linked
? It was reported how impressed the Queen was by Meghan's "energy and stamina..." during the Morocco trip, while the Duchess was "heavily pregnant."
Meanwhile, were you an attendant on the train during that famous and rare trip? I personally wouldn't presume to know exactly what intimacies the Queen and Meghan shared on that trip. But first of all, knowing a little about how the Queen is reported to have a disarming sense of humor behind-the-scenes with her family, I'm willing to bet she wasn't spending any of that time with Meghan lecturing her on royal protocol. 
Moreover, Harry was obviously thrilled to introduce Meghan to his grandmother, the Queen, and to his entire family, as he described during the November 2017 engagement interview: https://youtu.be/F45No-rWKls?t=804
And wow, what a stretch suggesting that the Queen “thought she had no other choice.” It seems to me that HM The Queen of Great Britain and the Commonwealth has plenty of choices and a lot of leeway to do exactly as she pleases, especially in regard to her family and to decisions she makes about who attends Christmas at Sandringham. 
Indeed Harry surely asked for permission, and he got it. There's nothing to debate about that. As far as the Queen being happy or not, I doubt she would invite anyone to Xmas at Sandringham whom she was not 'happy' having around. Regarding the Queen having the best poker face, there's no need to debate that either. However, in Cheshire, Meghan and the Queen seemed to be genuinely relaxed and having a good time together. Mostly smiles abounded, not queenly poker faces:
