Xiaohong better have proof that she didn't break it first. This must form a habit. When you get the book, look through it first to see if there is anything wrong. If so, explain it to the administrator immediately. If the feeling is not strong enough, ask the administrator to leave a note to prove that there are bad pages. If someone is present and knows that Xiaohong is not broken or has a bad page, he can also testify.

Then Xiaohong should coordinate with the librarian to explain that the book was not broken by herself, but was broken. If there is evidence, take the evidence, and if there is a witness, find a witness. If there is no evidence, be reasonable and present the facts, because librarians can't punish themselves with other people's mistakes.

If the coordination fails, the consequences of bad books will be serious. If Xiaohong is a minor, she can tell her parents or the class teacher to coordinate and solve the problem. If Xiaohong is an adult, she can communicate directly with the superior leader of the librarian, explain the ins and outs, and try her best to prove her innocence.