The Artist is Ukrainian, from Kyiv if I'm not mistaken and has been there through all the recent events. Not entirely sure if they write in the Ukrainian dialect, or like many before the war, were writing in Russian. They are similar but different from each other, but I'm not fluent in telling the difference.
Some of her work is translated to Ukrainian (for example almost entirety of Ishaar`s children), but all pictures from Femboi16 2021/2020/2019/2018 galleries have text only in English and Russian, no ambiguity (it's possible for some Ukrainian and Russian sentences to look/write the same, but it's rare case).