This is the 8140th most frequent Russian word.
леушина
"Леушина" is typically a proper noun, such as a surname or a place name, and does not have a standalone meaning in English.
In this sentence, 'леушина' is used as a proper noun, presumably a surname, referring to a character or person. It's the subject of the sentence.
Леушина всегда мечтала путешествовать.
Leushina always dreamed of traveling.
Here, 'Леушина' is a person's last name, combined with a respectful title, indicating an individual.
На улице, госпожа Леушина остановилась, чтобы поговорить.
On the street, Madame Leushina stopped to talk.
In this sentence, 'Леушиной' is in the instrumental case, denoting the author of the story or the person responsible for writing it.