I'm in complete agreement with the last couple posts... It needs to be said ONCE and simply enforced after that... I struggled with this mightily in the week or so after I gave "The Speech", but I'm extremely glad I haven't reiterated the statements I made.
I look at it this way: I said it, strongly, and a few times during the conversation we had. She WILL remember it... every last word of it... And if I have to say it again, I'm either saying "You probably didn't get this the first time" or "I'm trying to convince MYSELF of this right now..."