Why has she blocked me on WhatsApp but nothing else?

In case you’re wondering I haven’t done anything to this girl... I’ll explain

I had a female friend and other people told her I liked her (I don’t) but she believed them then cut me out of her life, a few months later I got the chance to explain that I didn’t like her and we started talking again (although she was very cold) after a while she cut me off again and when I sent her a message to try and sort out whatever was happening (I still don’t understand why she hates me) she blocked me on WhatsApp, but not on messenger or Instagram.

We are not friends on Instagram anymore but she hasn’t blocked me.
Why has she blocked me on WhatsApp but nothing else?
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