No one else's world revolves around us, just ours. That's the way is is with everyone, not just T's. I would ask the older ones to help with the littles, try to comfort them in their sadness and disappointment. It's not that you're not a "concern" when she's off, she needs to run her own life, take care of her own selves! Even an excellent mother has to have time away from her children, time of her own to regroup and regain her strength. She is human, only has so much strength, only so much to give and she's wise and doesn't want to overdo it and run out.