Next her unless she initiates contact with you again and use this as a learning experience for the future. You should never ask a girl out via a text message. When you text a girl you are giving her the option of whether she wants to reply back to you or not and whether she wants to go out with you or not. Automatically, you are making her the prize.
Remember, once girls know you want them, they do not want you anymore. They love sexual tension, therefore, you need to remain the prize even during an intial encounter with a girl. Now that I have established what you did do wrong, I'll tell you what to do next time... CALL HER! Texting is the p*ssy way of contacting a woman. I guarantee that if you were to call her, your chances of her saying yes would have been much greater (provided you displayed a confident, charismatic, and outgoing attitude.) Also, don't ask her, TELL HER! One last tip, give her an option but at the same time, let her know you're busy. I'll explain how to do all these things below in a break down:
First, you call her. Have a quick rapport session by initial conversation. Once rapport has been established and the conversation has reached its peak/climax, use a time restraint and say you need to go. (By doing this, she will have the frame of mind that "Aww man, I was having such a great time talking to this guy, I don't want him to leave.") This will make her anticipate the next time you call her! Except, right before you leave say "We should meet up for coffee this week (as an example). I'm actually quite busy this week, but I'm free on Tuesday and Thursday, so I can squeeze you in." If you established rapport correctly in the conversation, she would be dying to go out with you. In addition, statistically you have a greater chance of meeting her because you gave her TWO options of days to meet you, while keeping your balls at the same time.
You kept your balls because:
1) You let her know that your time is valuable, and you only have 2 days free. (This also reduces flaking, because my letting her know your time is valuable, she knows to treat it with respect.)
2) You did not ASK her to spend time with you, you TOLD her.
If you remember the advice I have given to you in this post, you should have no problem. If you have any other questions/comments about my post, feel free to drop me a PM.
Axcell.