This phrase could refer to a few things:
* A literary work: "La hija del fraile" is the title of a Spanish novel by Fernán Caballero. It is a classic of Spanish literature, often studied in high school.
* A person: It could be a person's name or nickname, indicating they are the daughter of a friar (monk).
* A general term: It could be used in a more general sense to refer to the daughter of any friar, without a specific reference.
To understand the exact meaning, more context is needed. For example, if you heard it in a conversation, what was the topic? If you saw it in a book, what is the surrounding text?
Let me know if you can provide more context, and I can give you a more precise answer!