The Maharsham (vol. 3 ch. 206) writes:
ובדין הכלה תוך ז״י המשחה ומלאכתה לחפור בגדים אם מותר לה לתפור בביתה הדבר פשוט לענ״ד שאם בעלה מסכים לזה אין חשש כלל דמצות התורה הוא על החתן שישמח אשתו וגם בזה יש דיעות דמהני מחילתה
And regarding the case of a bride within the seven days of festivity, whose job is sewing clothing, addressing the issue of whether it is permitted for her to sew in her home, it is clear, according to my humble opinion, that if her husband agrees to this, then there is nothing to worry about whatsoever. For the biblical commandment is specifically incumbent upon the groom to please his wife [and not vice-versa]. And even here there are opinions that [her] forgoing this right would be effective [in freeing the groom from his responsibilities] (trans. my own).
To summarize, the Maharsham combines two elements to reach the point of "no problem whatsoever": agreement of husband, and lack of obligation in the first place (for brides).
See also https://www.ou.org/jewish_action/12/2008/whats_the_truth_about_sheva_berachot/ (first paragraph under Background) and http://www.torah.org/advanced/weekly-halacha/5770/yisro.html (footnote 17)