Earlier in the series, Rowena tells Crowley that she doesn't even know who his father is because Crowley was conceived during an orgy. Now she's telling Crowley that she hates him because when he was born, his father told Rowena that he loved her but then left her and went back to his wife while Rowena lay half dead on a straw mat.
When Rowena is sipping her tea when Crowley walks in, visible red marks where the witch catcher may have been previously are already on her neck.