Is it permissible for a menstruating woman to wash and shroud a deceased person?
It is permissible for a woman, whilst she is on her menses, to wash (deceased) women and shroud them. And from the men, she is only allowed to wash and shroud her deceased husband. Menstruation is not considered something that can prevent (a woman) from washing a deceased person.
Fataawaa Al-Lajnah Ad-Daa’imah 8/369]