What happens to the storekeeper's wife, and how does the storekeeper buy Dearbhla's silenc

The next time Dearbhla comes to town, she learns that the storekeeper's wife has died. She realizes he gave too much of the powder and tincture she gave him for his wife and that he threw her down the stairs. She tells him to give the best of his wife's clothes to Papa. If he does not, she will spread the word about how his wife died.