This woman was first seen on the airplane as Lucien and Percival flew to Mexico. She apparently kept making Lucien go unnoticed as people kept bumping into him or dropping things on him.
Agin we ran into her at the “Masters Ranch” were the cult of fire used to be based out of, and where Joan disappeared.
She was collecting ash samples in the cellar, possibly looking for something m, but when she threw a burn wooden beam at Lucien, he shot her with one of the “guns of light” which killed her instantly.