We only know of the poor widow in Luke 21:4, because Yeshua made note of her in a “teachable moment” with His key students. Both Mark and Luke record Yeshua’s testimony of her as an example of a faithful giver. Her faithfulness was not in the amount of her gift in terms of monetary value but in terms of the percentage she gave in proportion to what she had. She did not give just 10 percent or a portion from surplus but everything.
She may have already spent all the rest of her means just to get to Yerushalayim (Jerusalem) in the first place. But if those rich people had truly had a heart for the Torah, she would have come there in comfort, not in desperation and extreme poverty (Deut. 16:9–15; 24:19–20; 26:12–13).