Does a menstruating granddaughter kissing her deceased grandfather after his ritual washing invalidate her grandfather’s ablution, and is she sinful for her ignorance of the ruling?

Kissing the deceased after their death is legally established, and there is no sin upon a menstruating woman for kissing the deceased, because her body is pure. The Messenger of Allah, peace and blessings be upon him, was asked about interacting with a menstruating wife and he said: "Do everything except intercourse." Moreover, the deceased's ritual washing (ghusl) is not affected by this, because religious obligations have ceased for them upon their death. Kissing out of compassion and mercy does not invalidate ablution (wudu).