1)
Should she sing?!
1.
Ibn Ezra, Ri Kara: Roni is raising the voice in song or lamentation. Also "va'Ya'avor ha'Rinah" (Melachim I, 22:36) is an announcement. Ri Kara - "Lishmo'a El ha'Rinah v'El ha'Tefilah" (Melachim I, 8:28) is to hear screaming and Tefilah.
2.
Rid: Rinah is Tefilah - "Lishmo'a El ha'Rinah v'El ha'Tefilah."
2)
When should she sing?
1.
Rav Sadya Gaon: At night, and especially at the beginnings of the Mishmaros. Rashi - the night is divided into three Mishmaros (Brachos 3a).
3)
Should the heart spill like water?
1.
Rav Sadya Gaon: It should be as if spills like water.
4)
What are "Atufim"?
1.
Rashi: They are fainting.
