I can help you only with the plot and the mood. Setting: Poland, before World War 1 in the twentieth century.
The Plot: The Washwoman was old and fragile-looking, but she was dedicated and strong. She would get the family's laundry and return it 2-3 weeks later. she was loyal, dedicated, hard-working, and selfless. One day she gets the laundry but doesn't return for 2 months. The family thinks she died. Then she returns, gives back the laundry, explains she fell sick, but never comes back after.
Conflict: The woman battles with her age and her health. Her son is ashamed of her. Struggles with the harsh winter. She becomes ill.
Mood: Serious
Theme: Someone who gives much but asks so little can still feel like they have had a great life.
Theme is debatable, it can be anything about selflessness or dedication.