In addition to the answer from @Dov, there are other mefarshim that discusses this.
Rashi cites the Gemara in Niddah 31a that says that there are three partners in the creation of a person:
The Sages taught: There are three partners in the creation of a person: The Holy One, Blessed be He, and his father, and his mother.
ה‘ — ;את קניתי is like ‘עם ה “with the L-rd”; she meant to say: when
He created me and my husband He created us by Himself, but in the case
of this one we are copartners with Him
The Ramban, however, begins to cite Rashi on this posuk, but then proceeds with his own explanation:
The correct interpretation appears to me to be that she said: “This son will be for me an acquisition for the Eternal, for when we shall die he will exist in our stead to worship his Creator.” This is also the opinion of Onkelos who translated eth hashem to mean “before the Eternal.” [The word eth in the following verses is translated] in a similar sense: And it shall be shown ‘eth hakohen’ (the priest),416 meaning to the priest; And David came near ‘eth ha’am’ (the people),417 meaning to the people. Or it may be that eth hashem has the same interpretation as in the verses: And Enoch walked ‘eth ha’elokim’ (with G-d);418 Noah walked ‘eth ha’elokim’ (with G-d).
Similary, the Chizkuni writes:
'קניתי איש את ה, “I have acquired a man with the Lord.” Chavah considered herself as having become a partner with the Creator. From the beginning of creation until Genesis 2,4, where the תולדות, derivatives of the creation have first been mentioned, the name used for G-d had always been elohim. This meant that the only attribute that G-d had employed was His attribute of Justice. During the period that He made various improvements, securing the continued viability of the universe He had created, the Creator has been referred to by both the name elohim, as well as the tetragram. This means that He was employing both His attribute of Justice as well as His attribute of mercy, רחמים. This suggests that possibly by G-d using these two attributes the universe would be able to survive all challenges.