However, Dong 'a and Dong 'a are completely different things. These two words are transliterated in Manchu. Dong 'e Manchu is Dongguo, and the accurate transliteration should be Dongguo. But Dong 'e doesn't know the original Manchu language because there is no literature source. However, according to the naming habit of Manchu women's names, the ending sound is probably a mistranslation of je.
As for Dong 'e's whereabouts, I personally speculated many years ago that if Dong 'e really existed in history, she should have married Bayas Hulang, the right-wing Tuxietu prince in Horqin, that is, married her cousin Princess Duanzhen. Lz, if you are interested, you can search my article.