| IOI's are just that, indicators of interest, it's never too early. Have you actually been gaming her (according to PUA standards), or just went your natural self? It'll be a lot easier for us if you translated your interactions so far into some PUA terminology. (Did you Kino at all, did she shit test you, is there a LJBF vibe going on or is there some healthy tension?)
Quiet and shy can also mean she just wants you to take the lead first. (When I first started, I got myself into a few situations where I almost could not stop myself from going "WTF!" out loud, because the most "quiet and shy" girls, after an hour or so, would be talking about sex, and how her ex-bf this and that (shit-test) blablabla.) I'd first try and see where you're at right now. (Is she interested in you?) You probably have to give us some more information before you can get some really good advice.
Though what you can do, is if you're going to pick her up again, call her beforehand and say you'll pick her up 30 minutes early, and go get some coffee with her. (I woke up this morning, and just had this urge to go to this really nice coffee place, you're coming with, you'll like it.) There's your first short 'date'. Same can be done after work, on your way to the car you get something to drink, sit down blabla (If you hit it off, you can even transition this after-work short date, into an actual full blown date. If you're hitting it off "Wait, are we on a date right now?", "In that case..." and you take her somewhere else blabla)
These short 'dates' actually don't require her to make any decisions whatsoever, she does not have to say yes to a 'date', so these are basically fail proof and great if you don't know where you're at or if she's really shy.
Let us know how the situation progresses, and good luck. (If you're naturally shy, you took a big leap in the right direction by offering to drive home and pick up a girl for work. Keep it up.)
-Zero
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