I thought I'd check your previous post you mentioned and link it here
first-time-trying-met-this-girl-vt70676.html?highlight= for people to see.
From reading it before it sounded like she was definitely into you, have you had any meetings since?
I personally don't believe in ultimatums, I think that if someone said to me "do this ____ or I'm gone" I would just fuck them off out of principle. But, hey, I'm not a girl and everyone's different.
However, I firmly believe that when someone is interested in you, and all of a sudden they withdraw that attention, it makes you feel insecure. You therefore start to doubt yourself, and feel like you have to qualify and justify yourself again to that person just to 'get them back'. So, my advice would be to distance yourself from her for a little while. If she doesn't initiate any contact within a week's time then forget about her. She'll realise her mistake and come back, but in the meantime you should have fun with your life. The more time you spend wasting on a girl who isn't acknowledging you is time that could be spent on better things, my friend.
Keep me posted
Good Luck!
phoenix;!