Answer is "She is frightened by Addie's tears."
Because in the story, she left the room quickly because Addie was crying:
“She’s crying!” She turned a bright, burning face up to the first old woman.
“That’s Addie for you,” the old woman said spitefully.
Marian jumped up and moved toward the door.
from " A Visit of Charity"A Classic American Short Story by Eudora Welty (1909-2001)