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

No File Exists
Check below answers in case you are looking for other related questions:
How can we respond to those who say that tawaaf is like worshipping idols?
Asking the Prophet (blessings and peace of Allah be upon him) and complaining to him after his death comes under the heading of major shirk

No File Exists
Related Answers:
It is not permissible to eat meat that was slaughtered for anyone or anything other than Allah, even if the one who slaughtered it mentioned the name of Allah over it
The hadeeth about the blind man that is quoted as evidence by those who seek to draw closer to Allah (tawassul) by virtue of the dead
Ruling on referring to tribal customs for judgement
How can we respond to those who say that tawaaf is like worshipping idols?
Asking the Prophet (blessings and peace of Allah be upon him) and complaining to him after his death comes under the heading of major shirk

Recommended answers for you:
Ruling on drawing animate beings
If her period begins before sunset, even if it is just a moment before, her fast is invalidated and she has to make it up.
Ruling on the crime of rape
Jinn Entering Human Bodies
Reasons for the punishment in the grave