Was what happened to my grandmother—the change in the color of her face and the emanation of a scent from her before burial—despite her diligence in prayer and fasting, due to the delay in burial, or is there another reason?

What was mentioned about delaying the preparation and burial of the Muslim woman's funeral until her appearance changed is forbidden (haram), because it violates the command of the Prophet, peace and blessings be upon him, to hasten the preparation and burial of funerals, infringes upon the sanctity of a Muslim, and contradicts the rights of parents. As for the change in the color of her face, it appears to be due to the changes resulting from the delay. As long as the woman fulfilled her obligations, she will see nothing but good. A Muslim must conceal what he sees concerning the states of the deceased, which people might mistakenly consider a bad sign, for "Whoever washes a deceased person and conceals it, will have forty major sins forgiven for him," or "forty times."