This comment makes no sense as when we learn our first language as children we know no other language.
The verb has to be inflected according to the gender and number of the subject:
Inflection of the verb essen on Wiktionary
die Frau is 3rd person singular, so you have to use the inflection isst.
die Frauen would be 3rd person plural, for which you'd have to use the essen inflection.
„Die Frau essen eine Orange.“ isn't grammatically correct.