For the source text click/tap here: Ketubot 58
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A woman is supposed to be sustained by her husband - this is the priority.
If she does not want her earnings to go to her husband, she is permitted to state that she does not wish to work.
However, the rabbis are aware that if the woman works and insists on keeping her wages to sustain herself while her husband is working to sustain her, animosity will develop.
The rabbis seem to believe that husbands would not be willing to understand a woman's need for savings and sustenance beyond the basics.
We explore the idea of “mishum eivah” in the marital and broader societal context of darchei shalom.