What does it mean when a girl hides her face when she laughs?

[Anonymous]

Sometimes i see girls looking down or putting their hands over their face to hide their face when they laugh. Why is this?

[laraWM]

If you consider psychology, it means she's embarrassed to laugh at it.
We obviously need more context to be sure of that

[Apocalips]

She's scared you'll catch her in an ugly fave moment. That's why I used to do it.