So I have this "friend"...?

[leopard]

That last week we were closer than ever and she turned into my best friend. Yesterday, she stopped following me in a social media and today when I started talking to her she looked so mad. She at first started talking to me but very serious and she is always sweet. Then at the end she didn't even wanted to be near me. I don't get her problem, I am always nice to her and last week we were fine and today suddenly she hates. I don't know I am just upset. Can someone give me an advice on how to deal with the situation please? I asked her earlier if she was mad with me or something and she said "no" but then she was still mad. Can someone please respond to this? It will really help! Thanks!