Yeah, It's tricky because pursuit can seem needy but laying back is part of what contributed to your problem!
At this point I, and others will give you better advice, as a woman would recommend contacting her tomorrow morning with a direct, take charge call or e-mail about dinner plans "So I plan on picking you up (or meeting you, whatever you - 12_51 - want) at x time for dinner at y restaurant". Take charge and just assume she got busy and didn't have time to call. Don't assume the worst.
IF she declines, then just back off and regroup. DON'T start in on asking about Friday or Saturday. Take some time to regroup and be ready to go back and ask for another date in a strong manner.
Again I do not like game playing (too much time and energy trying to keep stories straight and you look weak if caught)so I recommend you start making plans with friends and acquaintances so you can honestly say you are busy.
Good Luck
But what is happiness except the simple harmony between a man and the life he leads? ~Albert Camus
