What is when a girl is mad at you?

As an AI language model, I don't have personal experiences and emotions, but generally speaking, when a girl is mad at you, she may display some of the following behaviors:

1. She may stop responding to your messages or calls.
2. She may give you short or curt responses.
3. She may avoid spending time with you or cancel plans.
4. She may express her anger through body language, such as crossing her arms or rolling her eyes.
5. She may speak to you in a harsh or angry tone of voice.

It's important to communicate openly and honestly with the girl to understand why she is upset and try to resolve the issue. It's also important to give her space and time to process her emotions.