Who is the person exempted from Allah's saying: (Do not raise your voices above the voice of the Prophet)? And is Umm Ayman exempted from that?

The prohibition against raising one's voice above that of the Prophet (peace be upon him) is a general etiquette encompassing all believers, and his sanctity in death is the same as his sanctity in life. As for what occurred between the Prophet (peace be upon him) and Umm Ayman, it stemmed from her intense love for him and her eagerness concerning him, and her fond familiarity with him, like a mother who raised and nurtured the Prophet (peace be upon him). There was no annoyance or harm to him in it. The Prophet (peace be upon him) treated her as a mother, and the Companions preserved her affection after his passing.