She slept next to her daughter, and the child died. Is she required to do anything?

Question: My mother was working in the farm—this was thirty years ago—and after a hard, tiring day, she went to bed at night. While she was nursing her three-month-old daughter, she fell asleep with the child beside her. In the early morning, they found that the child had passed away. She does not know the cause of death; whether the child rolled over on her during sleep, or she leaned over the child with the breast in her mouth, she does not know the reasons for the child's death. So what is required of the mother?

Answer: The precaution for her is to complete fasting sixty consecutive days; because the apparent situation is that the child died because of her—if she does not know of another cause.
And among the principles of Islamic law is: acting with precaution in cases of doubt; in order to safeguard the purity of one's conscience from the rights of Allah and the rights of His servants. May Allah help her to complete it.