I think a question with a question is a great idea, if you think she'll go ahead and respond when you turn it back on her. I only say that because I know my H would get really annoyed with that approach (he has before, and for much lesser things), but if your W wouldn't be bothered, it seems to be the best way to get the info you need and it leaves you with a great deal of control.
M - 34 H - 36 Together 10 years Married 4 years BD - March, 2014