why did Marguerite have so much trouble trying to find out what to wear to Mrs.flower's house?

Maya doesn't know what to wear for such a special occasion. One day, Mrs. Flowers buys some things in the store, and asks that Maya, or Marguerite (her full name), bring them to her house to have a talk. Maya changes into a nicer dress to go to Mrs. Flowers' house, but Momma makes her take it off to show to Mrs. Flowers, who admires the stitching. Maya is completely embarrassed at being humbled like that in front of someone she admires so much.