The Prophet (ﷺ) fixed the bloodwit for the slain woman to be paid by the relatives of the woman who had slain her, on the father's side.

Abu Dawud said: In a similar way it has been transmitted by al-Hakam from Mujahid from al-Mughirah.
Sunan Abi Dawud Book 41, Hadith 76
← Previous Hadith A man of Hudhail has two wives. One of them struck her fellow-wife with a tent-pole and killed her and her unborn child. They brought the dispute to the Prophet (ﷺ). One of two men said: How can we pay bloodwit for the one who did not make a noise, or ate, nor drank, nor raised his voice ? He (the Prophet) asked: Is it rhymed prose like that of bedouin? He gave judgement that a male or female slave of the best quality should be paid in compensation, and he fixed it to be paid by woman's relatives on her father's side.

Sunan Abi Dawud Book 41, Hadith 75 Next Hadith → 'Umar consulted the people about the compensation of abortion of woman. Al-Mughirah b. Shu'bah said: I was present with the Messenger of Allah (ﷺ) when he gave judgement that a male or female slave should testify you. So he brought Muhammad b. Maslamah to him. Harun added: He then testified him.

Imlas means a man striking the belly of his wife.

Abu Dawud said: I have been informed that Abu 'Ubaid said: It (abortion) is called imlas because the woman causes it to slip before the time of delivery. Similarly, anything which slips from the hand or from some other thing is called malasa (slipped).

Sunan Abi Dawud Book 41, Hadith 77