Hey man, this should work well...
Use the cube, play it in smoothly after like 30mins of being on the date, then she'll say its pretty accurate as they always do, then say ok since you know so much about her, she gets to ask you any 3/5 questions, she wants, that way she'll beable to ask anything that may be concerning her, maybe shes afraid to trust you so she asks about how honest you?? are etc etc...
Good Luck
EDIT: take her for a drink so she can become more relaxed, and loosen her up alittle
