Naturally, it apparently comes from the back of her head.
Another female Wiccan also has this with her long hair once.
These, along with other censoring added to the American release, can be removed with the Director's Cut patch if one is so inclined.
Motivations for attempting or completing suicide while naked are discussed.
We don't get to see anything.
Just how often does it happen, however? Subverted in that her hair doesn't hide anything.