Princess Maria Luisa of Bourbon-Two Sicilies: A different wedding

Princess Maria Luisa Immaculata (1855-1874) was the youngest daughter of King Ferdinand II of the Two Sicilies.
In 1873 she married Prince Henry of Bourbon-Parma, Count of Bardi.
Suppose Maria Luisa lives numerous years past 1874. She does not wed Prince Henry of Bourbon-Parma.
Who does Princess Maria Luisa marry?
 
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