How to tell the difference between just friends and possible crush?

Equit
OK, I've had this best friend who is a girl, who I hang out with everyday. We've been good friends for a couple of years now, and we text each other and flirt with each other a lot. I've liked her since day one, and I know she's has had a crush on me before. I kinda wanna get something started with her, but I can't tell whether she wants me as just friend or as a lover. The flirting has just become routine.

Is there anything girls usually do to distinguish guys who are "JUST friends" and "crushes"? Anything that I could use to see where her interests lie in our relationship?
How to tell the difference between just friends and possible crush?
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