How often should I text her until our date next month?

Hey,

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I'm texting this girl for about 1 month now and she seems interested sending me 4-text replies to a simple question, laughing about the smallest things I say etc..

Anyway We have a date planned somewhere at the end of june when exams end. I don't know how often I should text her until then. Basically I still want to have things to talk about when we meet because we're talking about everything that people talk about on a first date currently. On the other hand I don't want to let "the flame" to die out by texting less if you know what I mean.

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What do you think? Thanks for reading!