Is expiation for accidental killing obligatory for a woman whose fetus died in her womb due to negligence or ignorance of health rules? And is it permissible for her to fast for two months instead of emancipating a slave, especially since there are reliable channels for performing emancipation?

If a pregnant woman performs an act that typically leads to a miscarriage, and the fetus aborts as a result, she is obligated to pay the ghurrah (one-tenth of the mother's blood money) and perform expiation (kaffarah (definition)). The ghurrah can be waived if the heirs pardon her. However, the kaffarah cannot be waived; it involves freeing a believing slave. If she cannot find one, then she must fast for two consecutive months, based on the Almighty's saying: "It is not for a believer to kill a believer except by mistake. And whoever kills a believer by mistake – then the freeing of a believing slave and a compensation payment presented to his family, unless they give [it up as] charity. But if he was from a people hostile to you and he was a believer, then [the compensation is only] the freeing of a believing slave. And if he was from a people with whom you have a treaty and he was a believer, then a compensation payment presented to his family and the freeing of a believing slave. And whoever does not find [one or afford its price] – then a fast for two consecutive months as repentance to Allah. And Allah is ever Knowing and Wise."