farrockgrandma> A young men takes on most mitzvas at the time of his bar-mitzvah. For a girl/woman, we are responsible for the most important mitzvas at the time that we marry and start a family.
I would hope that the lady would spend previous years preparing for that great mission whether by being a sidekick to her mother or babysitting or/and actually learning. After a child is born, it becomes a little hectic to learn …
I also noticed that men tend to delegate sholom bayis to their wives, even if a lot of gemoras direct their instructions to men.
I once offered a chatan a book about sholom bayis (that I thought he needed). His immediate reaction was “I am sure my kallah has such books”.