Why isn't she texting me?

So 2 weeks ago I met this girl in my driver's ed class. She would sit with me at lunch and try to be in the same car as me just about every time she could. I got her number on the last day of driver's ed. So the next day I texted her and we texted for a little bit but then she said she had to go to a swim team practice. So I texted her to have fun and I didn't expect her to text me back right away so I waited. She never texted me that night. I sent her a text that said goodnight though. So today she still hasn't texted me so I sent her a text that said her name with a :) after it. Still no reply. Do you think she is avoiding me or just hasn't been on her phone?
Why isn't she texting me?
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