I think we can all identify with Ma in this instance. While I love my children dearly, and truly enjoy their company in the home, it is nice to have some time alone. I would often have alone time when the children were much younger and they would take naps. It was a glorious time. I would get some uninterrupted cleaning done, perhaps work on dinner prep, catch up on e-mails or blog reading, or simply sit on the couch in complete silence and enjoy those few moments to relax.
Motherhood is strange in that way. We spend the first season of our lives thinking mostly of ourselves, only to be followed by the joyous season of marriage and family, in which we begin to think mostly of others. I believe it is part of God's design that mother's miss their children when they are not around; a longing of the heart. It encourages us to be better mother's when they return.