Theoretically she could be called Queen Mother as the widow of a de iure King of France.
Thanks An Ard Ri
More Christine Boutin than Saint Louis !
We are not interested in Spanish Law when we speak about the Head of the Royal House of France. HRH Prince Louis of Bourbon is Head of the French Royal House of Bourbon and all the titles he has are linked with France not with Spain.
There is another thread about the Succession to the Throne of France. Here we speak about the news regarding HRH Prince Louis of Bourbon.