What does She tracked down the documents in library mean?

This sentence means that someone, "she", was searching for some specific documents in a library and she was successful in finding them.

Here's a breakdown of the meaning:

* "She tracked down" implies a dedicated effort to find something, likely with some difficulty. It suggests that the documents weren't easily located.

* "the documents" refers to specific papers or records.

* "in the library" indicates that the search happened in a library, a place known for holding a collection of books and other materials.

So, in essence, the sentence tells us that someone searched for and found specific documents within a library.