What does it mean when a girl puts her finger on her lip?

Anonymous
You might think I'm stupid for asking this question, but I have asperger's syndrome which makes me socially awkward and have difficulty reading other people's body language. So treat me as if I'm ignorant on this subject.

Only until recently, my college friends have been inviting me to nightclubs nowadays, which gave me the chance to develop my social skills and talk to women.

I managed to exchange contact with a girl I met at a club and have been talking on Snapchat with herfor the past weeks. I'm sending normal selfies of myself with normal captions and she is constantly sending me pictures of herself cutting the top half of her face with one of her fingers in her mouth.

What does that mean? Is she telling me to be quiet or something? Help me please.
What does it mean when a girl puts her finger on her lip?
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