I'm happy your wife has found a relief for her headaches.
According to the headache description, she was suffering a type of headache, known as occipital neuralgia.
The pain is caused by irritation or injury to the occipital nerves, which can be the result of trauma to the back of the head, pinching of the nerves by overly tight neck muscles, compression of the nerve as it leaves the spine due to osteoarthritis, or tumors or other types of lesions in the neck.
Best wishes for you and your family!
Marija