I have a feeling this question was made for you.
Actually, I think “she” is more accurate. The Hebrew as written doesn’t have a vowel–it can be translated as he, she, or they. Most Christians translate it as “he” thinking of Christ. Jews translate it as “they.”
jtsa.edu/community/parashah/jpstext/bereshit.shtml
If we look at the rest of Scripture, it is never actually Christ crushing the head of the enemy, but someone else doing it by the Lord’s power.
Two other women called blessed among all women and predictd to be praised by all generation, Jahel and Judith, both by the power of God strike at the head of the chief enemy.
Judges 5:24 Blessed among women be Jahel the wife of Haber the Cinite, and blessed be she in her tent.
25 He asked her water and she gave him milk, and offered him butter in a dish fit for princes.
26 She put her left hand to the nail, and her right hand to the workman’s hammer, and she struck Sisara, seeking in his head a place for the wound, and strongly piercing through his temples.
Judith 13:17 Judith said: Praise ye the Lord our God, who hath not forsaken them that hope in him.
18 And by me his handmaid he hath fulfilled his mercy, which he promised to the house of Israel: and he hath killed the enemy of his people by my hand this night.
19 Then she brought forth the head of Holofernes out of the wallet, and shewed it them, saying: Behold the head of Holofernes the general of the army of the Assyrians, and behold his canopy, wherein he lay in his drunkenness, where the Lord our God slew him by the hand of a woman.
20 But as the same Lord liveth, his angel hath been my keeper both going hence, and abiding there, and returning from thence hither: and the Lord hath not suffered me his handmaid to be defiled, but hath brought me back to you without pollution of sin, rejoicing for his victory, for my escape, and for your deliverance.
21 Give all of you glory to him, because he is good, because his mercy endureth for ever.
22 And they all adored the Lord, and said to her: The Lord hath blessed thee by his power, because by thee he hath brought our enemies to nought.
23 And Ozias the prince of the people of Israel, said to her: Blessed art thou, O daughter, by the Lord the most high God, above all women upon the earth.
24 Blessed be the Lord who made heaven and earth, who hath directed thee to the cutting off the head of the prince of our enemies.
25 Because he hath so magnified thy name this day, that thy praise shall not depart out of the mouth of men who shall be mindful of the power of the Lord for ever, for that thou hast not spared thy life, by reason of the distress and tribulation of thy people, but hast prevented our ruin in the presence of our God.
26 And all the people said: So be it, so be it.
Likewise, St. Paul writing in Romans exhorts them to trample the serpent by the power of God. It’s never Jesus Himself, He’s always working through someone else.
Rom. 16:20 And the God of peace crush Satan under your feet speedily. The grace of our Lord Jesus Christ be with you.
I think the she refers to both Mary and the Church (Mary being the image and a precursor of the Church.). Just as Mary has already trampled Satan under foot, so will the Church by the power of her Seed tranmple him.
Plus, if we take into account private revelation (we which are not bound to of course), the renderon of “she” is pretty much a closed case–Our Lady of the Miraculous Medal, Our Lady of Guadalupe and others all show Mary crushing the serpent.