WI: Charles VI of France marries Elisabeth of Lancaster

Is it possible for Charles VI of France to marry Elisabeth of Lancaster, the daughter of John of Gaunt? and what would be the consequences?
 
Maybe having them married as a part of a peace treaty for the hundred years war.

With Elizabeth being the mother of the next French King, she could become the most powerful woman in European history, especially if she becomes regent of the young King while Charles goes through his insanity.

Plue it is not impossible with her sisters marrying into foreign royalty, Philippa, became Queen of Portugal while Catherine, was married to the future King of Castile.
 
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