Why a girl would like to have a conversation with you, asking about your weekend but when you ask her she always says nothing much?

A girl ask me how was my weekend and I told her what I did over the weekend. But when I ask about her weekend she always replies that she does nothing much. Clearly she does not want a conversation or talk to me, then why ask about my weekend. She talks with her guy and girl friends she talks and tells them about her weekend
Why a girl would like to have a conversation with you, asking about your weekend but when you ask her she always says nothing much?
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