Thanks for the advice guys! Denver, you're right, not coming down until Saturday doesn't really matter, except for the fact that if she's coming down Friday, then she'd want me out of the house on Friday as well... So adding a little intrigue into the statement seems like a good idea...
And no one thinks that response sounds too cold? I know she's used to me writing more lengthy responses and that by not doing that, i'm showing a different side... I just don't want to come off as flippant...