How to text a girl?

There is a girl who recently joined my sport class.

We went in a same competition and talked about things l, we also have mutual friend.

The next day she texted me about the other day and we talked about our sports a lot l, she also sent me a voice messages (but still texted her tell me if this is bad)

the next day she texted me if there was a training on the next day and starting texting each other, we talked about fishing and foods aswell

Today she didn't text me anything and i don't know what to do, can't initiate texting

Tell me what would be the best solution?

Should i text something (i have no idea what) or should i wait 4 days to see her again in the sport class?

How to text a girl?
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