That being the case, then it is imperative that she have a deeper, in some aspects tough, conversation with her husband about her desire - absent coercion or undue influence, repercussion, and reprisal - prior to embarking on this journey!
Keep in mind, and judging from the assumptions I made from her writings, they are fledglings thus are not yet developed nor equipped to endure the whirlwind of challenges that most certainly will come from the advice you gave.
Please know, I am not casting any aspersions towards you or specifically the advice you provided; Just highlighting that said advice is better handled by more seasoned/experienced couples who have developed some level of fortitude to deal with such challenges. That's not to say seasoned couples won't be challenged by it, but through life and other worldly experiences will have a few 'tools' or 'avenues' to engage the challenge without it causing total destruction.
Again, the intent is to have both freely go into this lifestyle of their own volition, embrace their new found roles, and not harbor any resentment/hatred towards the other.
All of this is my sole opinion and is not an indictment nor reflection of any other opinion (favorable or not)...