My crush didn't say hi back?

Anonymous
I've had a crush on this shy girl for awhile, and we had been looking at each other for ages (she was the one started it which was what made me interested in her), we've briefly talked to each once and it went fine, that was the day before we were gonna take our exams and I wished her good luck and she said thanks with a smile. The other day I waved and smiled then she said hi back and smiled (whilst quickly looking back to her phone). Finally today I snuck up behind her, lightly poked her arm and I said hi , but she just looked at me then went the other way around :( does she not like me or hate me now? I felt embarrassed by it
My crush didn't say hi back?
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