"Trad wife" had the sound to me of some sort of not necessarily complimentary new moniker. Not having heard it before, I resorted to W'pedia as a starting point and the rather new term is Tradwife. The W'pedia article is not clear whether its an insider or outsider term, but the quasi-definition characteristics make it sound like the term was coined by outsiders and have an othering feel.
Basically, a Tradwife is a woman who has chosen to go with the traditional stay-at-home-Mom/wife role. IOW, while the term apparently came into usage, my Mom and my wife could each be described as "tradwives" (my wife was a SAHM until our children had reached adulthood, and has been employed outside of our home for quite a few years).
Submitting to abuse such as described in the DU OP is not being a "tradwife", based on the W'pedia description, nor a Christian wife. I could cite Scripture demonstrating the latter, but I doubt that any DU-onlurker would much care about facts if the facts contradict what they want to believe true.