@CDBubba,
She's very very tired and maybe a little postpartum......taking care of a 3 year old and a one year old can be exhausting. All she is doing is changing diapers, feeding children, bathing them, trying to get them to take baths, it can be utterly exhausting......No matter how much you love your children (and you do) it's a big, big job. Getting a 'weekend' off doesn't alway recharge you to your pre-children self, a lot of women just sleep (because they are exhausted).