Well, can the condescension. She is still your friend and her life is equally relevant. Assuming the worst. Not being there. Not showing up.
Big emergencies are understandable.
But being a mom does not automatically give you carte blanche to ditch your other obligations. As charming as this is, it's also naive. Don't project your endless interest in your own offspring onto others. Unless we are your kids' godparents or see them on a daily basis, believe me, more than a couple of minutes of kid talk is a yawn. A prerequisite for mothers who think is that they think about things beyond their own motherhood.