Iconology

The clothes are strange. Some leaves on her head, a large blue cloth summarily draped over a white apron, the theatrical manner in which she carries a book and trumpet. Who does she represent?
Looking through a book on iconology, we discover that the person holding the book in which history is written, generally Herodotus, as well as the trumpet of Fame is Clio, the Muse of History.
The young woman is looking neither at her book, nor the painter, nor the spectator but at the still life of objects in front of them.
A large, open leather-bound book, a plaster mask with its eyes turned toward the light. It is likely that the book is a musical score, the symbol of Euterpe, Music. The mask could be the representation of Thalia, Comedy.
The subject's meaning becomes clearer. The painting might represent Vermeer painting Clio, the Muse of history, surrounded by Euterpe's and Thalia's attributes.