How do you reply to "Have a good day" text from girlfriend/boyfriend?

Anonymous
We've been dating for 6 months. Way past our honeymoon phase. Girlfriend is busy so we haven't hung out for a while, text was been decreasing. But she still responds to texts. Normally she'd respond saying "Thanks you too!" but this time it was just "thanks" in the afternoon. Is she avoiding my texts now? Am I just overthinking?
How do you reply to "Have a good day" text from girlfriend/boyfriend?
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