Significance of Edna Butler

Edna is a friend of Gladys' and was maid of honor at her wedding. She is a seamstress and comes to visit the first day. She spends the first night since it is dark when they finish dinner. The next morning on a bus, she overhears a conversation about the house of Garland Avenue and how the whites plan to put the Sweets out later that night. She calls Gladys with the information.