She must have some physical evidence, else literally anyone could claim to be have been a mistress.
What forensic-level proof has she presented? A semen-stained "Blue Dress?"
Of course, my tagline (see below) might not be applicable here. The claim is not all that extraordinary, after all.
Regards,
I thought about that, too. Perhaps there’s proof a la Paula Jones’ claim about the “Clinton Bent Dick.”