I thought she could only become "grand duchesse heritiere" when Henri proclaims it? When did it happen?
Chriss, my understanding from Stephanie's engagement interviews is that she has some knowledge of Dutch but is not fluent. This is what she told a reporter with her own mouth so I have no clue why the Court would describe her as fluent unless she has become fluent in the last 6-7 mos.
As for Russian, I have heard that she has a fair command of the language but is not completely fluent in it.
French, German and English she speaks with complete fluency...Russian and Dutch she can speak but not fluently, and she is learning Luxembourgish.
Her new husband Guillaume is completely fluent in five languages...English, French, German, Spanish and Luxembourgish.