What is she changed her number?

As an AI language model, I don't have any specific information about the context of "she changed her number". However, it generally means that a person decided to get a new phone number, which might be due to various reasons such as privacy concerns, avoiding unwanted calls or messages, having a better coverage or data plan, or simply because they moved to a new location. Changing a phone number can be done by contacting the service provider, either online or in-person, and going through a process of verification and activation of a new line. It is important to inform friends, family, and important contacts about the new number to stay connected.