In an ideal world, perhaps she can find a dominant partner who actually believes that the D/s dynamic confers a responsibility to guide a submissive to be a better person. (Not all kinky folks follow this, but some do.) He could use the D/s dynamic to encourage her to do the work to really be the best wife and mother possible. Also, she could get her kink fix, and stress release, within that framework.
(I see these dynamics more often with M/s than D/s, but it us out there.)
Maybe it's not something she can get with this guy, but it could be something the two of you could look for together.