Lillian O'Grady
From Super-wiki
A hunter named Lillian O'Grady found the infant Eileen Leahy in her crib with her ears bleeding, having gone deaf from the piercing scream of the banshee which killed her parents. Lillian raised and trained Eileen to be a hunter, while also attempting to track down the banshee. Lillian died of cancer when Eileen was 16 years old, leaving her on her own to hunt. Eileen continued to hunt the banshee that killed her family and finally got her revenge in 11.11 Into the Mystic.
