If a girl blushes or her face gets red, is it a sign that she likes you? Or what does it mean?

NickPal
There's this girl i like. She's a cashier at the food mart, i go to her almost everyday and buy things i don't need but just to talk to her. Somehow she came to know that i like her. How do i know if she likes me?
If a girl blushes or her face gets red, is it a sign that she likes you? Or what does it mean?
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