Any reason she kept saying saying nice meeting you?

In short I was talking to this girl and she kept repeating "It was nice meeting you" She said it when we first met then midway through a conversation and as I was leaving she said it again. Maybe she forgot she said it but she said it multiple times within a few minutes. Why does she keep saying that? Did she forget she told me that?
Any reason she kept saying saying nice meeting you?
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