oomis1105 states “Even if quoted in the Gemarah, the story of the woman is NOT halacha, nor meant to be considered as such…It was simply her own opinion, right or wrong…But that does not mean that THAT is the reason she was so blessed.”
The Gemara wasn’t written as a story book. If the Gemorah relates the story than 1) she was right 2) it is meant as a lesson for us, we can learn that being careful to cover ones hair even in private is a zechus for having good children 3) Nowhere does it say that it is halacha just a very praiseworthy hanhage