Lowering a woman into her grave does not require a mahram
Machine translationRead the Arabic original
Q: If the deceased is a woman and she has no awliya (close friends of Allah), is it permissible for someone to volunteer to lower her into her grave?
A: There is no objection to that, even if her awliya are present. One of the daughters of the Prophet (peace and blessings be upon him) was placed in her grave by people other than her mahrams, while he (peace and blessings be upon him) was present.
A: There is no objection to that, even if her awliya are present. One of the daughters of the Prophet (peace and blessings be upon him) was placed in her grave by people other than her mahrams, while he (peace and blessings be upon him) was present.
Source
binbaz.org.sa
The Arabic text is copied verbatim from the original source, without any edits.