Make sure she has one of the updated packs that are compatible with the game, and make sure that the .cfg file is going into the MAIN FeralHeart folder.
Make sure got the updated version Click Here (http://sephalovable.deviantart.com/art/Legendary-Markings-Feral-Heart-Marking-Pack-V4-538589673?ga_submit_new=10%253A1465509748&ga_type=edit&ga_changes=1) and that she put the markings in the markings folder and not textures.
Media>textures>markings. And that she replaced the .cfg files.