You've already scheduled a date with this girl? Do yourself a favor, then, and do NOT send her a text. Don't even try contacting her or having communication with her again until the date. Contrary to popular belief, it's better to stop communication once you get the date than it is to try and continue talking with her leading up to the date. Let her spend the time you'd spend texting her thinking about you instead, and how great the date is going to be. As evidence has shown on these boards, sending a text prior to the agreed upon date can have one of the following results:
1. You send her a text, she doesn't respond. You start getting paranoid about what her lack of response means, and you now wonder if this means she even wants to go on the date anymore.
2. You send her a text, and she responds. You end up in an unplanned 2-hour texting conversation, during which you joke or say something that's taken the wrong way. She gets upset, and flakes on the date.
3. You send her a good morning text that sounds sappy or lame, and she shows it to her girlfriends. "This is the guy I'm going to meet up with this weekend," she says to them. "Ugh," says her hating girlfriends, "are you sure? His text to you was so lame." Now she starts having second thoughts about seeing you (I know it seems like a fake scenario, but I've seen this happen before)
Bottom line: once you get the date, there's no need to do things to help convince her that she shouldn't see you. So, again, I'd recommend NOT sending her anything. Now, if she hits you up for some reason it's okay to respond (though you don't want to get into a full-on convo if you can avoid it), but save as much of your convo with her for the date as possible. Good luck!