If you are speaking, but want to emphasize that you would write 她 rather than 他 at a certain point, how do you do that?
I know ways to say the person you are talking about is a woman, as 倪阔乐 suggests. I wondered if there is a way to indicate that the word you are saying would be written 她 without just saying so.
A history article at http://www.harvard-yenching.org/cultural-history-of-the-Chinese-character-ta points out that the hundredth birthday of 她 is coming up.
At the time the character first entered use several other neologisms were coined to indicate women:
“女界(women’s world/women),” “女英雄(female hero),” 国民之母(mother of the citizen),” “女国民” (female citizen), and “英雌 (heroic female).”
But again, each of those comes out and says woman or mother explicitly.