There is no clear statement in the bible that will prove if a woman has to work only at home. What is being stated in the bible is that there is a need for women to love their family especially their children. The moment that a woman has children, this should be her main priority. She should make sure that her children grow up to be healthy and strong.
It does not matter whether the mother has to work only at home or outside. What matters is that she would be able to balance everything. She will have time for her loved ones while she works hard in keeping her family comfortable. The role of a woman is often praised in the bible.