Does my 4yo even have curly hair??

My 4yo hasn’t had a haircut yet, but she’s asked for one so we’re headed that way. I had the thought that her curls will get trimmed off forever, since it’s so straight at the top. I have very straight hair, but I’ve been trying to educate myself on how to take care of hers. Is there something I need to know about getting hers cut? Does she even have curly hair, or are those baby curls and she grew out of them?