Don't know how to properly add a new page but this has another option now. I believe it's a persuasive 27 challenge (88% with my persuasive 40)

Dig up dirt on her. The truth will be more damaging than anything you could make up. (This may earn you Scraps of Incendiary Gossip.)

The shifting of the silks (Success) She has a string of lovers, all unknown to each other (though several embarrassingly well known to her friends). She weaves a constant web of duplicity, playing people off against one another – and seems to be having a thoroughly good time with it all. That is, until you dispatch a few anonymous notes to people she'd rather have kept in the dark. What she has weaved, she now must wear. + 1 x Scrap of Incendiary Gossip