She remembers things I said from ages ago that I don't even remember myself?

So this girl I know, she remembers things I've said to her about me or things I've commented on, from ages ago so much so I don't even remember it myself. Then one day she will bring up something I said to her ages ago out of blue.
Am I over reacting, I find it a bit creepy? I don't know why she'd even bother to remeber them?
She remembers things I said from ages ago that I don't even remember myself?
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