Why did she do this and what should I do?

I went on a first date with a girl i met on a dating app a few weeks ago and i think it went well, a few days after the first date, we started talking and setting up a second date which she mostly initiated. During the middle of this, she just stopped responding... i gave it a few days and sent her another message, and she replied and said sorry and said she had a class, that was almost 2 weeks ago, i replied and she didn't reply again.

I haven't sent another message since and dont know if i should. Should i send her another follow up message?

Why did she do this and what should I do?
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