Grisette

A young woman carries a package—she could be on her way to deliver an order from a dressmaker.

Grisette is defined as follows by Émile Littré in Dictionnaire de la langue française: Young woman who has a trade, such as dressmaker, embroiderer, etc., and who readily allows young men to court her.
(For the definition of lorette and a little more information on respectability rankings in nineteenth-century French society, see this footnote to our article on Paul Gavarni.)