וַתְּלַקֵּט בַּשָּׂדֶה אַחֲרֵי הַקֹּצְרִים

וַתְּלַקֵּט בַּשָּׂדֶה אַחֲרֵי הַקֹּצְרִים

She gathered in the field after the harvesters

In the Torah their is a mitzvah of לקט and שכחה. The mitzvah of לקט means if one or two stalks of grain fall, a poor person may keep it. The mitzvah of שכחה is that any piles of grain "forgotten" in the field needs to be left for the poor.

The video below shows someone cutting down stalks of grain and making them into piles.