I don't have much experience with following through, but I've got a heck of a experience with backing down. You're doing it. You've got a chance. You've got nothing to lose. Go for broke! Why shouldn't she be the one who feels awkward when you come into that shop again?</bad advice>
She gave you her phone number! You should at least give her one call (to check it wasn't fake ) to ask to go have a drink or tag along with her friends or something (is there something wrong with the latter ).
P.S. the way your head works, it's the stuff what soap-opera's are made of :')

And if she does have a panel of geeks backing her, she's perfect for you!

You were faster than me, I was going to quote CGamesPlay:

And one more that came to my mind:

That said, you're thinking too much, but if you insist stop going for sandwiches, stay inside your cave, let your meal driven to home. Pay under your door in order to stay out of contact and so on

Allright, so I got that almost right. I thought it's sandwich from Subway. But anyway without a context and with a bit of sick humour, one could think something else

Are you sure you didn't mean to say disadvantage?

I think she's just a very nice person. That's certainly the impression I've gotten chatting with her while she made sandwiches. She's very friendly with everybody that comes in. That is, instead of just outright saying no, she offered to be friends instead.

It more or less comes down to accepting friendship and just being friends or else refusing that. I don't even know her at this point so it really doesn't matter to me either way. Maybe she's the contradiction to my generalizations that I've been looking for. Or maybe not.

I thought people just stalked each other on Facebook these days.

Quick, kill her while you still have a chance and before she can exploit and take advantage of your friendliness. You hate people.

I meant the emphasis to be very selective about what he said he liked to do.

I don't even know her. I just wanted to maybe get to know her. That's all. I'm not invested in her at all.

I think we need a photo of the lovely lady, taken by stealth naturally, so we can offer more accurate advice.

I'm waiting for the day when both sides are a.cc members but they don't realize that. And both people create threads that describe the same situation. However, both sides have such a different view that it isn't obvious until 100 posts later when they are both giving each other terrible advice.

Hint: The term "date" refers to the calendar date you're supposed to go do something. So if you have an appointment to get audited by that ugly old woman at the IRS, you have a date with her.

Or a rendez vous as the french say

This is all silliness! Just proceed as normal, as if nothing happened. When she asks you why you never called, pretend you don't understand. She will think she is making it all up. Then she will want you very badly.