I think that the 'it was all so alien to her' explanation for Meghan's discomfort and Megxit is often overcooked.
Totally agree, @GiveMeSpanakopita , she gets quite a lot of benefit of the doubt... and yes, in many different ways Meghan has positioned herself as an intellectual, humanitarian thought-leader and woman of the world. Did she so much as pick up a book or flip through the folder created for her when she joined the RF? I doubt she did, but would be happy to be corrected.
Perhaps the real problem was that she was not treated with the deference and admiration she felt she deserved. Probably not the best PR to admit that publicly, though. Far better to pretend that people who curtsy, or people who don't like hugs, or people who are not glued to email 24/7, are an alien species.
There were times when she received a lot of adulation, for instance on her wedding day - notably during what a pp wittily dubbed "a carriage ride to nowhere". People lined the avenue and were practically throwing roses at her feet. But the adulation wasn't constant enough, and she must have felt it begin to dwindle too soon. Her difficulty assimilating has to be at least partially down to this, because her failure to understand the ways of the British and the RF does not fit with her supposedly important role in the UN and her diplomatic/political aspirations.