You should find a way to get contact of the nanny, cuss her the fuck out like no one has done before. Tell her dad that he is a cunt for telling his own daughter that, & oh yeah. Fuck up her boyfriend if he raped her, that is completely bullshit & if my bestfriends boyfriend raped her, I would feel no regret by putting him in the hospital. But overall, just be there for her no matter what. Show her that no one else in this world deserves more trust then you for being there when she needs you most. If her & her bf are split up, I'm not telling you to do this, but maybe you should try making things a little more serious between you guys. Best of luck man.