What does it mean when a girl sends you selfies of her, is it a sign she's interested?

elmo2016
I was just wondering cause my best friend is girl but she hardly ever sends me selfies of her haha but we are very close like family. And I've also got friends who are girls but they hardly ever do it too.
What does it mean when a girl sends you selfies of her, is it a sign she's interested?
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