The pair met in 1852, apparently F.J. fell in love with her, but the marriage could not take place due to political matters.
Pss Anna eventually married the following year Pr. Frederick William of Hesse-Kassel.
Sophie wanted to marry her son to her niece Helene. Of course she was her sister's daughter, but a "mere" duke's daughter.
Wasn't there any catholic King's daughter available for the all mighty Emperor of Austria ?
The only king's daughter that was linked to F.J. was Pss Sidonie of Saxony whom he met after breaking up with Anna of Prussia.
He was not at all interested in her and poor Sidonia, who was not very favoured by beauty, died of thyphus, aged 27, unmarried, after her father having rejected the marriage proposal to widower womaniser much older king Victor Emanuelle II of Italy.