1)
What "Shikutzim" will He cast on her?
1.
Rashi: Dirty clothing that befouls her. The verses depict her as a Zonah.
2.
Radak: Repulsive matters to ruin your beauty and make the entire world despise you.
2)
What is "k'Ro'i"?
1.
Rashi: Like excrement. This is like "v'Hesir Es Mur'aso b'Notzasah" (Vayikra 1:16).
2.
Radak citing Targum Yonasan: I will make you ugly in the eyes of all who see you.
3.
Malbim: A filthy matter.