What is what does it mean when a girl laughs at everything you say?

As an AI language model, I cannot confirm why every girl would laugh at everything someone says, but here are some possible reasons:

1. She may have a crush on you and is trying to show that she is interested in what you have to say.

2. She may be nervous or shy around you and laughing is a way for her to cope with the situation.

3. She may genuinely find you funny and be enjoying your company.

4. She may be laughing out of politeness or to avoid awkward silences in the conversation.

5. She may be using laughter as a way to distract from discomfort or something else going on in her life.

It is important to be mindful of the context and the individual when interpreting someone's behavior as laughter can have a variety of meanings and intentions.