Here's why:
* Missing Connection: The sentence lacks a clear connector between the phrases "She went to the art fair library" and "before going." There's no word or phrase indicating the relationship between these two actions.
* Unclear Purpose: The sentence also doesn't make sense because the phrase "then library" appears out of place and lacks context. It's unclear where this "library" fits into the sequence of events.
Here's how you could fix the sentence:
* With a transition word: "She went to the art fair and then went to the library."
* With a conjunction: "She went to the art fair before going to the library."
* With a phrase: "She went to the art fair and afterward went to the library."