Girl I was gonna date isn't replying to me?

I met this girl a while ago and we've been texting since, I used to think I annoyed her when I messaged her but turns out she likes when I message her, so I asked her out and she was happy that I did and said yes, I asked if she's alright to wait 2 weeks until I finish exams and she said yes, we planned out what were gonna do and stuff and now I finished exams, she doesn't reply to me? I've texted her and it says seen but no reply and I've messaged her a couple of times but she still hasn't replyed, what do I do?

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