I would first kindly send her an inquiry requesting your pictures to be removed from her site, immediately. If that doesn't work, I would go to her facebook and other social networking sites and make it known, publicly, that she is plagiarizing your work. I'd give her a heads up, that should be enough to get her to take them down, so you shouldn't have to go that route. I do think this would have better success than C&D, etc. This craft is an art, artists must be creative! These people won't have satisfaction, or success now, or ever.