Lady Blanche is a picture of devotion, charm – and criminal intentions. A social butterfly with a dangerous bite one might say. Shakespeare did try to warn us “hell hath no fury like a woman scorned”.
Indeed, a woman does always know. Lady Blanche wishes, oh how she wishes! that she did not. The real crime you see is the inelegance of not having kept all of this where it belongs – in the dark, with the lights off! (Cross her at your peril.)