Girl does not respond to my message for a long time, but things were nice before, what should I do?

Hello,

I met a girl online, we chatted very nicely, the conversation was good and not one-sided, I managed to make her laugh, then I decided not to wait long and I invited her for a date. After she saw the date offer, she immediately followed me on Instagram and told me she needed to travel with her friends for two weeks, but after she gets back, we should meet.

I waited two weeks, I did not text her during her trip. I messaged her after she came back but she did not respond like one day already but she is being active on Instagram and she comments her friends pictures. Does she try to make me feel nervous or test me? What should I do? and if that true, why girls are doing such childish things? It was happening to me before as well

Girl does not respond to my message for a long time, but things were nice before, what should I do?
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