What is the meaning if your friend doesn't LIKE your facebook?

We've been good friend to this girl for more like 1 year. When we are together she treated me as her friend and very touchy. She is also fun to talk with and she seems comfortable talking with me. However on my Facebook, she never like any of my status or even profile picture. I sometimes Like hers. I wonder why she acts like a little weird on Facebook and real life. What do you think guys?
Updates:
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but she keeps on uploading groufie pictures and sonetimes it includes me. she is always online
What is the meaning if your friend doesn't LIKE your facebook?
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