This worked for me with all my three Drakkins.
Stand at loc -675, -2025, that is in the middle between the fungus cave and the puma cave on the north-south axis, and in the middle between the east wall and the river to the west. Nice spot with easy overview of all the roamers. And it is the roamers you want. Simply start killing everything that roams close to you and after a while you will spawn The Hollows Widow. She should walk right past you.