Oh, great news about the interview. If I were you, I'd just keep that under my hat until you know if you have the job or not.
For tonight, look good (as if you have something special planned either earlier or later), be a little mysterious(which doesn't mean you have to tell any untruths, but if you don't have to tell everything as if giving her an update), be upbeat (without over-kill),and show a good attitude. Don't appear rude, but don't fall all over her, either. As Coach would say, be her catnip.
Good luck!
Oh, and wear some new cologne that you've never worn before That will make her wonder. If she asks about it, just be vague.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!