Is it normal for texting and intimacy to slow down in a relationship?

So long story short I have been seeing this girl now for the past 9 months and everything has been going great. We live a short distance apart and see each other maybe 3 or 4 times a week. In the beginning everything was great, she would blow up my phone every day and was so keen.

Lately I have noticed she has stopped a lot of the texting and calls and most days now I have to initiate the conversations. When we do talk on the phone its become very brief and she doesn't have a lot to say some times. Also when we are together I noticed too that she is not as affectionate and our sex is not as frequent as it used to be either.

I suffer from anxiety and I have asked her if everything is okay with us and she said that it is. But something feels off, is this normal?
Is it normal for texting and intimacy to slow down in a relationship?
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