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According to this website it is Because Shabbos it self is a queen http://www.askmoses.com/en/article/205,152557/Why-do-we-recite-the-Aishet-Chayil-A-Woman-of-Valor-on-Friday-Night.html

The simplest answer is to show gratitude to the woman of the house who lead the preparations for Shabbos. She is likely tired and over-worked and deserves our sincere thanks! Rabbi Eliyahu Lopian zt”l (1872-1970) recounted a great mystery which he set out to solve. When he first came to learn under the Alter of Kelm, Rabbi Simcha ...

See the Otzer Dinim U'Minhagim quoted in this answer, discussing Shir HaShirim. Quoting Minhagei Yeshurun, one of the answers is that Friday night is the time of intimacy between a man and wife.

Try to follow the "rythm" of the whole pasuk: Chen and Yofi (if they come by themselves) in a women are either hevel or sheker (need some translation help with the nuances) but in contrast stands the woman who has Yirat Hashem. SHE will be praised. By saying Isha Yirat Hashem we understand that Chen and Yofi are connected to the Yisha. Now we need the SHE. ...