Is expiation obligatory for a woman who miscarried due to doing household chores?

Question:
May Allah reward you. This questioner from Riyadh says that she is a woman over sixty years old who suffers from diabetes and heart disease. She says that a few years ago she was pregnant with twins and miscarried in the fifth month. She states that on that day she was doing household chores, such as gathering firewood and other tasks. She notes that this work was her daily routine and was not limited to the day she miscarried. The question is: Do I owe an expiation? She adds that she is unable to fast due to her illness and advanced age. Please advise us, O Shaykh.

Answer:
If the work was ordinary, as is her usual practice, then she owes nothing. However, if the work was unusual and involved hardship beyond the norm, and the miscarriage of a fetus that was four months old or more resulted from it, then she owes an expiation, which is freeing a slave. If she cannot find one, she must fast for two consecutive months.