There seems to have been a list, written or not, of widows. The church members met these women's needs for shelter, clothing, and food, and these women were expected to devote their lives to serving the Christian community.
As Paul will explain in 5:11-16, widows who were younger than 60 years old might get married again. Therefore the Christian community was to care only for widows who were older than 60. (See: [[rc://en/ta/man/translate/translate-numbers]])
Washing the dirty feet of people who have been walking in the dirt and mud is one way of meeting other people's needs and making life more enjoyable for them. This probably means she did humble work in general. AT: "has done common work to help other believers" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Some versions translate "believers" here as "the saints" or "God's holy people." The essential idea is to refer to Christian believers.
# has relieved the afflicted
Here "the afflicted" is a nominal adjective that can be stated as an adjective. AT: "has helped those who are suffering" (See: [[rc://en/ta/man/translate/figs-nominaladj]])
# has been devoted to every good work
"has given herself to doing all kinds of good deeds"