Here is something that I have not heard in any of the times that circumstances have happened to break my heart and some times is needed to be said.
THAT FUCKING SUCKS!!!.
I personally would try and find her. Talk to her, and ask her in person if what she said was true. If you are convinced that it is, then you may have to just try and educate her parents on how BDSM is just a diffrent way of loveing someone. There are a good many books out there as well as tons of articles here and on other sites about it.