She happened to come to the part of the field belonging to Boaz. That word happened is the narrator's way of saying: no human being planned this. Ruth didn't plan it. Boaz didn't plan it. But God was arranging something—quietly, in a barley field, in the middle of the era of Judges—and what it looked like from the outside was a foreign widow getting lucky. The companion written study for this episode is available free at https://bibleforthebroken.org/p/day-210the-field. You can explore the full library of studies and resources at BiblefortheBroken.org.