I believe that is a fishtail braid with some pretty headband looking thing. A little past my time period, but evidence of one braid! Niccolò di Pietro Gerini, La Remise des orphelins à leurs parents adoptifs, Musée del Bigallo, Florence
Bejís Medieval: El traje medieval femenino en el S. XIV - The site is in Spanish, but the imagery is awesome reference material! I particularly like the hair accessories used here. And the dress in the foreground.