If Chris is on trial and does not want to testify in court, which amendment protects her from testifying?

The Fifth amendment to the United States Constitution provides that Chris has the right to be free from self-incrimination. This means that she has an absolute privilege not to testify against herself in a criminal proceeding. She cannot be compelled to testify by subpoena and may only testify in a criminal trial if she chooses to voluntarily do so.