Washing Her Head due to Janabah or Menstruation is harmful to Her, so is it enough for Her to wipe over It?
I am a married woman and I am afflicted by an allergy in my chest, I have bronchitis all year round... so how can I pray? Can I make Ghusl without washing my head, wiping over it only, bearing in mind that I suffer a bronchial attack several times a week when I wash my head, and many times I do not pray due to my inability to wash my head or just wipe it. I am very uncertain, worried and upset, even though I know that the religion is easy, so I implore you to benefit me with an unequivocal reply, so that I can live in faith and perform my obligations in full, bearing in mind that I am a teacher, and every day, I go out to work and I am affected by the weather, which usually causes me to be confined to bed because I am ill. And Allaah knows that I am torn between the duty of married life - which means to obey my husband - and above that, obedience to Allaah.
If washing your head with water due to Janabah and menstruation is harmful to you, then wiping it along with Tayammum will be sufficient for You, based upon the Words of Allaah, the Most High: So keep your duty to Allaah and fear Him as much as you can.  And the words of the Prophet (sallallaahu alaihi wa sallam): Whatever I forbid you, avoid it, and whatever I order you, do it as much as you are able. 
 Al-Anam 64: 16.  Al-Bukhari no. 7288 and Muslim no. 1337.
Shaykh `Abdul-`Azeez Bin Baz
Fatawa Islamiyah Vol. 2 Page 64