Mother of Hannah Abbott, a Hufflepuff in Harry’s year. She was found dead in the fall of 1996, murdered by Death Eaters (HBP11).
Although never stated, we can deduce that Hannah's mother is Muggle-born because Rowling has stated that Hannah is Half-blood (PC/JKR1). Hannah's father, Mr. Abbot, is from the Pureblood Abbott family, so it is likely that he was Pureblood himself. If so, Hannah's mother would have been Muggle-born for Hannah to be a Half-blood.
Perhaps it was her Muggle-born status which singled her out to be killed by the Death Eaters in 1996.