"Then ... she called." The phrase "it came about" is used here to mark the next event in the story. (See: [[rc://en/ta/man/translate/writing-newevent]])
Here Potiphar's wife is accusing Joseph of trying to seize her and have sexual relations with her. "He came into my room to have sexual relations with me" (See: [[rc://en/ta/man/translate/figs-euphemism]])