It seems to me that it was implied that the sleazeball who was going to film himself having sex with Amy drugged (and possibly raped) Elly!
It would explain why she was acting drunk and disorientated the next morning even though she insisted she'd stopped drinking. He was certainly very sinister...
However, I think it's unlikely Neighbours would tackle such a serious storyline and Elly appeared to be unscathed afterwards (well, until the snake bite that is), so I'm really not sure what to make of it.