Hi! I'll be glad to be of help with this issue.
I can imagine how frustrating this situation must be for you. From the fact that you are asking, it seems pretty clear that you would like something to develop between the two of you. That really needs to be the deciding factor here, but within bounds.
Because there is no objective right or wrong in whether you should pursue this or not. The fact that she hasn't actually met up again may mean that she is just the kind of person who hates to say no and so she hopes you'll get the message. Or that she's a flake. That's possible.
But it could also mean that she's genuinely busy and that her schedule has a lot of unpredictability. That's also possible. To determine which is more probable is not yet easy. And it's not required that you spend a lot of time analyzing it.
This is because it's acceptable and not being weird if you try a couple more times. Alternatively, if you outright ask her if she would like you to keep trying. Either way is okay. I personally prefer outright asking if she wants you to keep trying. but you might not feel comfortable asking outright. If so, then try a couple more times. If after that she still hasn't found a way to make it happen, then it would indeed be time to move on.
Okay, I wish you the very best!
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