there is a report system...very hard to find...
The "Authentic Member?" link at the bottom left of her profile, which then takes you onto another menu isn't too hard to find at all. i.e. once in the next menu, click on the "If you believe that bigbreastedbeauty69 is in breach of our Terms of Use, then please report them to us here" link - again at the bottom of the page. From the next menu select "Fake profiles"
Upload some of her photos onto ImageFap or xhamster and then report her for using fake/stolen photos using the above reporting process. Just submit the same links on ImageFap/xhamster that match her profile photos.