* Simple Braids or Plaits: Braids were very common for girls and women of all social classes in medieval times, but especially among the working class. One or two simple braids would keep the hair out of her face while she worked.
* Unbraided Hair: If it wasn't long enough for braids, the hair would be kept at a short to medium length.
* Headscarf or Coif: A simple linen or wool headscarf (a kerchief or wimple) would be worn frequently, especially when working outdoors. This would protect the hair from dirt, sun, and the elements.
* Material: Wool, linen, or burlap were the common fabrics.
* Color: Natural, undyed colors would be typical.
* Cleanliness: Due to the hard labor and limited access to cleaning supplies, her hair likely wouldn't be washed very often. This would make it more prone to tangles and matting.
* Lack of Decoration: Ornaments or fancy hairstyles would have been unheard of. Ribbons or other decorations would have been a luxury she couldn't afford.
In summary, think practicality and simplicity. Her hairstyle was a reflection of her harsh life and designed to keep her hair out of the way while she worked.