Is it normal for a girl?

A girl told me she liked me and I asked her the reason why she liked me.. she replied that she doesn't know the reasons why she likes me but I should know that she likes me and each time i keep asking for her reasons she gets upset. She aIso said that if I needed anything she'll pay for it.

But my concern is about the reasons why she likes me cuz it's weird to me.

Is it normal for a girl?
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