"Margaret of Anjou is often portrayed as being disappoint at the birth of Margaret of Lancaster, something that is evidently false. Unlike many of her contemporaries, Queen Margaret was overjoyed at the birth of her first and only child, spending hours doting on her. In one of her own letters, Margaret described her child as being “The sole light of my world”. So contrary to Philippa Gregory’s Margaret, the real Margaret took delight in her daughter’s birth.”
Hedwig Johansson, “Debunking 50,000 myths about history”
“While many nobles quietly complained about the Queen’s failure to provide a son, Margaret and her supporters shrugged it off, an heir was an heir after all. Margaret chose to name her daughter after herself and England’s Saint Margaret, who was also an ancestor of Princess Margaret as it happened. On November 10th, Princess Margaret was baptised by the Archbishop of Canterbury, Cardinal John Kemp. Margaret of Lancaster’s Godparents were Lady Eleanor Beauchamp, Duchess of Somerset, Anne Neville, Duchess of Buckingham, and Cardinal John Kemp [1].
The Dukes of Somerset, Exeter, Buckingham, and York would all attend the baptism, recognising Princess Margaret as Henry VI’s natural daughter and heir. Many were quick follow the dukes and would also acknowledge Princess Margaret. as Henry VI’s daughter, and as the heir presumptive of England, though her position as such would not be indisputable until Henry VI himself recognised her [2].”
Lauren Johnson, “Two Margarets: The Story of a Mother and Daughter”
“The Duke of Buckingham and Margaret of Anjou would soon take the young Princess Margaret to Henry VI, in hopes she could help free him from his stupor, and officially be acknowledged by her Father. The result was… disappointing, to say the least. Henry VI would raise his eyes and stare at the young girl for several seconds before lowering them back down afterwards [3]. Margaret of Anjou would soon begin to fear that her daughter’s place as the heir to England would be usurped by the Richard. As a result Margaret of Anjou began thinking of ways to secure her daughter's status as the heir to England. At first, she may have considered marrying Princess Margaret to James III of Scotland, then to the Duke of Buckingham’s Grandson before considering marrying Princess Margaret to a son of one of her Tudor in-laws. But events in 1454 convinced her to make a deal with what she saw as the devil [4].”
William Dudley-Jones, “The Good Duke: The Life of Richard, 3rd Duke of York”
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[1] Mostly OTL. Eleanor Beauchamp serves as Margaret's second Godmother similar to how Edmund Beaufort was Edward's second Godfather.
[2] Edward of Westminster was in a similar boat AIUI.
[3] Pretty much what happened in OTL.
[4] Hm, I wonder who this could be?