Why was she embarrassed to hug me in front of her friend?

This girl hugs me all the time when she sees me and I playfully tickle her sometimes, too, when she does it. However, when she saw me today, she was with her friend. She came up to me like usual, all happy and everything, but instead...shook my hand?!?!

Why did she do that? It probably has something to do with her friend.

Her friend is a girl, btw.

Was she too embarrasssed to hug me in front of her friend?
Why was she embarrassed to hug me in front of her friend?
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