Frau Hermann, the mayor's wife, is the kind woman who gifted Liesel a journal to write down her own stories. This journal became what is known as the "The Book Thief".
Frau Hermann allows Liesel to enter into the library and let's her read the books. Though she caught Liesel stealing a book from library at the beginning, she was kind enough to forgive her and let her use the library.
Liesel who actually came to pick up and drop off the laundry at Hermann thought that the mayor's wife enjoyed at other's sufferings. However, as they get to know each other while reading and talking in the library, they become like mother and daughter. Liesel gets to understand how lonely and grievous Mrs.Hermann is after her son's death in the war. In fact, Mrs.Hermann takes Liesel into her home after her parents' death.