I think there are many women who share your pain, Asister. Sometimes I think these types of holidays cause more pain than joy, in the overall scope of things. Not just single women or married women who are unable to have a child, but also those who have lost a mother, or who were abandoned by a mother, or had a mother that didn't know how to love or care for them; women who have had abortions or miscarriages, or who gave their child up for adoption, or lost a child to death, or whose child grew up to disappoint them ... all are reminded of their pain on mother's day.
Mother's Day hurts so much because it's a reminder of your pain. And your sister-in-law's unkind act rubbed salt in that wound. Not only was it an unkind thing to do, it also wasn't very motherly. A good mother doesn't just love and nurture her own children, she loves and nurtures others, also.
I once heard a Mother's Day sermon in which the pastor explored all the wonderful things God created women to be -- not just mothers, but nurturers in all kinds of capacities and roles. He said that he hoped that every women there -- not just the mothers -- would leave church that day feeling great about being a woman whom God created.
I often think of that now on Mother's Day, and inwardly try to celebrate that fact, and commit myself once again to be the woman God created me to be.
Hold your head up, Asister. You don't need to be a mother to be held in high esteem by the God who created you. You just need to be faithful to Him, and faithful to what He has called YOU to be. He doesn't call every woman to be a mother, and your calling isn't any less than being a mother.