I don't think she really understood what being a royal would involve at the start. That story about her being outraged that gifts sent to her were returned seems credible.
She saw being royalty as higher level of celebrity. When in reality yes it's lots of privilege and fame, but it's not without it's trappings.
Harry should have explained more what the life would be and Meghan should of taken up the queen's advice to be guided by Sophie.
The penny dropped probably way before the wedding but it still all went ahead.
No one accidentally befriends a range of people like piers Morgan, Tanya burr and made in Chelsea types unless they have big ambitions.
Their half in and half out stuff was totally unworkable. They can't do royal stuff occasionally to maintain the profile and in-between this sell themselves out to whoever writes the biggest cheque. In the documentary they acted that the royal family was stupid to not go for this deal with all the free value they'll add
.