She may not even have seen your text. If she did not or could not check her messages she did not know you texted her. Does she know that you CAN text her? I mean, does she know you have her phone number? If you got her texting information from someone else besides her, she might not reply back to you. Always ask for permission to text a girl (or guy)if you do not know this person very well. If you did not ask permission, it is not too late to ask now! Good luck.
Try to remind if you had hurted her feelings before or maybe she's finding your text less important . stop texting her for a day and try later . it would be disturbing to her at the moment .not responding to text doesn't mean that she doesn't like you
I have sometimes not texted a guy back because I liked it so I didn't seem so desperate to reply so quick to him. But I have had times when I didn't have good service or on a phone call, she might just be busy too. Don't always think the worst. Hope all goes well with her :)