Final answer:
The question confuses different literary works, but the letter found by Liesel in 'The Book Thief' is from Ilsa Hermann, with Liesel reacting in a multifaceted way.
Step-by-step explanation:
The question seems to be mixing details from different pieces of literature. In The Book Thief, the protagonist, Liesel, does indeed find a letter in one of the books she steals, but the passages provided refer to A Doll's House by Henrik Ibsen and The Purloined Letter by Edgar Allan Poe. In The Book Thief, the letter Liesel finds is from Ilsa Hermann, the mayor's wife, expressing her understanding of Liesel's situation, and it's left in one of the books in the window. Liesel's reaction is complex; she feels a mix of embarrassment, regret, and gratitude towards Ilsa Hermann for recognizing her love of books and for the words of comfort offered in the letter.