This is the 86th most frequent Croatian word.
ona
"She" or "that one" (feminine).
Here, 'ona' is a pronoun referring to a female subject, used to indicate the subject of the sentence.
Ona je učiteljica.
She is a teacher.
In this context, 'ona' appears at the end of the sentence for emphasis, referring to a specific female subject.
Djeca su rekla da će doći ona.
The children said that she would come.
Here, 'ona' is used as a demonstrative adjective to specify which house is being referred to.