Is there a sin or expiation upon my friend after she miscarried her fetus at three and a half months due to her neglect of the doctor's recommendations?

It is forbidden to abort the fetus after 120 days, and it is considered killing a soul. As for before that, it is forbidden but does not amount to killing a soul. If the woman intentionally causes the miscarriage by abandoning medication and rest, she must repent. However, if the miscarriage occurs without her intention or knowledge, there is no blame upon her.