This is what her 5 best friends disclosed, this was the first public mention of a letter.
"Following the wedding, Meghan penned an emotional letter to her father.
“She’s like, ‘Dad, I’m so heartbroken. I love you. I have one father. Please stop victimizing me through the media so we can repair our relationship.’
Because every time her team has to come to her and fact-check something [he has said], it’s an arrow to the heart,” the insider explained."
She clearly wanted the public to know she had sent a letter of reconciliation to her father, her friends did not do that without her authority, no matter what she claims.
I don't think anyone can justify what her family did to her, they are toxic and she rightly cut them out of her life.