I agree that she wrote it expecting it would be exposed and this is what was argued by the DM in appeal. It’s a shame - none of this would have happened if he hadn’t shared the letter.
Her friends gave an interview to People magazine where they revealed the letter. To know about it, Meghan must have discussed it with the five of them. We don't know if she okayed them to do the interview - but I think we can be fairly certain they will have checked with her. She has been clear since her engagement interview that protecting her friends was important to her and she'd surely expect to be protected back. What might be less easy to presume is that she told them it was OK to discuss the letter. However, they did.
Thomas Markle felt he got a bum rap over it so he released the letter through the DM. As he'd never mentioned it you that point, I think its fair to assume he hadn't intended to release it. Otherwise he'd have done it earlier.
At this point I think it's a draw. One side attacked. The other side counterattack.
But I think the Meghan made an error suing. She clearly had the law on her side, but there's a reason the royals don't go to court. It leaves the oposition able to obtain all sorts of information. And the court case exposed that despite saying she'd not cooperated with Scobie, she had fact provided information and was willing to provide more if asked. She had to apologise to the court for misleading them.
It also showed that she had used language in letter deliberately chosen to influence the public in her favour if it was ever made public. It left in the public's mind the fact that she lied and she used a letter to her father to manipulate public sentiment.
So although her friends and her father brought her to that point, it was her own decision to sue and I think it cost her more than she gained because now when people defend her against the accusation of lying, people immediately point to the court case where she admitted to that very thing. (I think someone said it to you when you asked about her lying?)
But of course that's just my opinion and she might have thought it was worth ll that negative exposure just to beat a tabloid.