Girls, please explain the difference between friendly and flirting?

Anonymous
So this girl who I work with, we don't have cintact outside of work, the only time we see eachother is in work. We both get on very well, and have become quite close. I'm just wondering whether she's being friendly or maybe a little more. Are there different ways you can tell? What's the difference?
Girls, please explain the difference between friendly and flirting?
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