You are still good, make sure next time when you make plans with her you add something like:
"what is the chance of you not showing up to (w/e it is)."
"the reason im asking this because when i say im gona be or go somewhere I always keep my word, I am dependable and stick to my word, and I really value this in other people too, and one thing that can end our "frendship" before it begins is flakiness."
This sets the mood on flakiness good, she knows you not some sucker and will not tolerate people who dont respect you and your time
(make sure to use frendship even thou you may not want to, it shows her you not really attracted to her and want her as a friend, she is gona start thinking y he isnt into me? what is wrong with me? etc, she will start thinking about you thus becoming more attracted. But also add some sexual tension etc.. this will give her mix signals).