What is she lost interest overnight?

As an AI language model, I do not have access to specific information about an individual's situation without context or details provided. "She lost interest overnight" is a vague statement that could refer to a variety of situations such as a romantic relationship, a friendship, a job, or a hobby. It could be caused by a variety of factors such as a change in personal values, external circumstances, or individual experiences. Without more specific information, it is difficult to provide any further insight.