This is the 470th most frequent Italian word.
figlia
"Daughter."
In this sentence, 'figlia' is used as a noun to denote a female child in relation to the speaker.
La mia figlia studia all'università.
My daughter studies at the university.
Here, 'figlia' describes a familial relationship of the girl to her parent, indicating descent.
Quella ragazza è figlia di un famoso scrittore.
That girl is the daughter of a famous writer.
In this usage, 'figlia' is being used in an attributive manner to denote the role or status of the person as the eldest daughter.