A girl calls you out the blue, does that mean she is interested?

Anonymous
A girl called me on Saturday and wanted me to go to a club with her and her friends. I've told her that I was staying in for the night. She also told me about her friend birthday next Saturday and told me that I should come. Does this shows interests? Also, would call a guy out the blue? Even if its your friend.
A girl calls you out the blue, does that mean she is interested?
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