Actually most of the above is false. The arizal explains according to the zohar that women are the source of Dinim- judgment. Hair on a women’s head is also dinim and it’s most appropriate according to the arizal for women to keep their hair which is dinim as Yafeh Dinim Shemitarin Minah. According to this explanation it would be best for women to not only NOT shave their head but they should never even cut their hair. The opposite is true for men- they are Rachamim and they must cut the hair in the head because the hair is Dinim.
Another spect is that as a child growing up with neighbors who was Chasidish, they would explain that shaving the head was an age old custom. However when a young kala was about to her married and her hair was shaved, both sides of the family would get together and encourage her to do so bit many times the kala would break down in tears. Often they would go into a depression ans require psychiatric help. A women is allowed to retain her hair and look appealing to her husband.
For all the reasons above I am of the opinion that this custom should not be followed and there is no source for it in the zohar whatsoever.