I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state or sovereignty, of whom or which I have heretofore been a subject or citizen; ...Now, the State Department will probably not come after your fiancée if she takes the oath and then continues to act as a French citizen. There's a brief discussion of this issue in the exhaustively-researched Dual Citizenship FAQ; see in particular questions #5 and #9. But the U.S. State Department's practice of not pursuing such cases is, I believe, only a matter of policy; it's not a matter of law, and so it could change without very much notice.
...la déclaration peut être souscrite après un délai de 4 ans à compter de la date du mariage à condition que la communauté de vie tant affective que matérielle n’ait pas cessé entre les époux depuis le mariage. Ce délai de communauté de vie est de 5 ans si le postulant n’a pas résidé en France de manière ininterrompue et régulière pendant trois ans à compter du mariage ou si le conjoint français n’a pas été inscrit sur le Registre des Français établis hors de France pendant la communauté de vie à l’étranger. A la date de la déclaration, la communauté de vie tant affective que matérielle ne doit pas avoir été interrompue depuis la date du mariage. Elle ne doit pas être réduite à une simple cohabitation.Briefly, if you haven't lived in France regularly (11 out of 12 months) for three years following your wedding date, then instead of waiting 4 years for citizenship, you have to wait 5 (in France). You also need to know how to speak French; this is a relatively new requirement. Unlike other EU countries, there are no required language courses for prospective citizens, France considers self-motivation a factor to prove in learning its language (the same page states much the same thing; i.e. that an applicant can be refused if they've proven uninterested in learning French).
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posted by Dansaman at 1:47 PM on October 3, 2012