How can you tell if she's just not a texter or of she just doesn't wanna text me?

So I've gotten lots of advice from friends before when I end up in a situation with a girl and she is taking and absurd amount of times to either reply to my texts or not reply at all. One thing I always get from friends is " maybe she's not a texter" and to be fair I do have a friend who is like this and will take like three days to get back to you if your lucky. so how do I tell the difference between when she's just not a texter and just doesn't want to text me or simply isn't interested.
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