Russian Translation
Она невероятно наивна.
What’s ï doing here?
To quote from Google “It is a mark placed over a vowel to indicate that the vowel is pronounced in a separate syllable”. Not used too much these days though “The New Yorker uses it regularly” as in Brontë. (I have to say I rather like it, very stylish;-).
The English word “naive” comes from French “naïve”.
Although you can definitely write “naive”, some English speakers (presumably to appear more sophisticated and worldly 
) prefer the French spelling: “naïve”.
In French, the two dots above a vowel mean that the marked vowel (here i) and its preceding vowel (here a) are to be pronounced as two separate vowels rather than to be merged into a single syllable in their pronunciation.
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