Is it permissible for a woman to wash and shroud a deceased person whilst she is on her menses?
It is permissible for a menstruating woman to wash deceased women and shroud them. And from the men she can only wash her (dead) husband. Menstruation is not considered a prohibition from washing a dead person for burial. And to Allaah belongs all (bestowal of guidance and ability to perform good deeds).
[Al-Fataawaa al-Mar’atil Muslimah compiled by Daarus sahaabah and Daar Sabeelil Mumineen with the recommendation of Shaikh Muhammad al-Imaam, page: 302 or see Fataawaa al-Lajna Ad-Daa-imah 8/369]