Where’s the editor?

I was reading a book last night and found an ambiguous phrase. Andrew and I had a good laugh over it.

“her blond hair fell from a simple knot halfway down her back”

Possible interpretations
1. Her hair was in a ponytail and middle-of-the-back in length.
2. She had really long hair and around the middle of her back she tied a knot in it.
3. She didn’t have any hair on her head. Instead, this poor girl has a knot in the middle of her back that has hair growing out of it.