I have view the photos, they were very good, and your dog is beautiful.
If the hair loss is just secondary to a healing traumatic skin wound, it may resolve on it's own. Her hair should begin to regrow with in a week. If it is itchy than she should be examined again ASAP because hair will not grow back with constant scratching.
Please have your vet perform a skin scraping, bacterial and fungal culture, and ringworm check on the hairless area The possibilities include mites, such as demodex, a fungal or bacterial pyoderma (skin infection) due to an underlying abscess, trauma or foreign body (splinter, awn), yeast infection, skin allergy to a toy, other object, or something in the dirt, or auto-immune skin disease.