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Advice

I had been messaging a girl I'd met on Tinder for a few weeks now, and we'd arranged to possibly meet up. She messaged me stating that she had been busy all weekend and had been unable to message me. The meeting didn't go ahead.
Since then, she's been extremely 'hot and cold', some days being very conversational and others not replying at all. It's obviously confusing as I would like to meet up with her at some point. I often find I'm having to remind her to reply and I don't know what else to do. It annoys me because I see her online sometimes and even though she's replied to me, she won't reply. I don't know what else to do. Any ideas?