Maybe this sounds cheesy, but I would write my number along with "Next Coffee is on me - The coffee guy" on a napkin. Replace "The coffee guy" with your name if she knows it, I wasn't clear from your story if she did or not. Keep it in a safe place, when she comes in with her coffee give her the special napkin.
Of course just catching up with her after work and asking her if she would like to go out would be the direct preferred way.
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