She was advised to bathe in water that had been used to wash a dead person!
Question

A woman was stricken with a calamity and went through a time of fear that led to her eyes protruding, and she was advised to bathe in water that had been used to wash a dead person. Is that permissible?.
Praise be to Allah.Since using this water is not a means of healing, whether according to sharee’ah or science, then using it is a form of minor shirk, because minor shirk means using as a means something that cannot be a means. 
What this woman should do is to recite ruqyahs for herself that are prescribed in sharee’ah, such as al-Faatihah and al-Mi’wadhatayn (the last two soorahs of the Qur’aan), and there is nothing wrong with seeing doctors to treat her problem. 
We ask Allaah to heal her. 
And Allaah knows best.