My alien fiancee lives in the Philippines, does she have to speak, read and write the English Language?

There are many reasons that an alien fiancee needs to have a fair amount of English skills not only for attending a U.S. Embassy Interview but entering into their U.S. Port of entry. Almost all of the government paper work is done in English as well as interviews conducted in English. If she barely communicates in English and the U.S. Citizen Fiance only speaks English, well then the Interviewer will believe that she couldn’t possibly be able to have a sincere genuine relationship with him? The only exception would be if it is a U.S. Citizen Filipino who is native to her language.