What Does She Mean When She Says Thanks For Noticing?

A girl who’s always acted like she had a crush on me dyed her dark brunette hair to a really beautiful medium golden brown color. I asked her if she dyed it that color, and that it looked really nice. She replied with an amorous tone in her voice, “Thanks for noticing!” Then just ran off, while texting away to someone on her phone, probably bragging to a female friend how much she loved the compliment. But, it could be wishful thinking on my part.
What Does She Mean When She Says Thanks For Noticing?
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