Jesus Christ, this, a thousand times this! Stop texting her, don't even think about facebook, pick up the phone and talk to the woman! WTF is wrong with so many of the posters on GD who can't understand why relationships don't always blossom even though they "texted and facebooked and EVERYTHING?!"
Here's what you do.
1. You dial her number on a telephone (ask a grown-up if you're not familiar with 'calling')
2. "Hi, OP here. Are you keen to go to the party on {date} which we're all going to?"
3. Her : "Yeah, sounds good."
You : "Great. Want to get the [transport] over together? Oh listen, sorry for those texts earlier, I was really busy and should have called you."
OR
3. Her : "No, I'm busy washing my hair/other obvious get-out excuse."
You : "Oh ok, no problem. Enjoy [thing that she's doing]! Oh listen, sorry for those texts earlier, I was really busy and should have called you."
4. Insert [awesome thing that you're off to do that evening/next evening].
5. Ask what she's got planned.
6. End conversation on good, non-creepy terms.
7. ???
8. Profit!
edit :
GODDAMMIT YOU MANCHILD! STOP TEXTING HER AND SPEAK TO HER!