We still don't know who has primary custody of the child. If it is the father, and the family are all out of state, and they don't celebrate holidays on religious grounds then it is not that strange that KB wasn't reported missing for a while. If you have an acrimonious separation you don't necessarily need to 'speak' to a one year old every day on the phone.
What would be unusual, IF it's the case, would be for the father to be given custody in the first place, IF that is the case (we simply don't know). Wouldn't it? For a one year old baby?
IF the father were to have been given custody, then I can also imagine a scenario where the mother takes off, feeling that she is unwanted, or useless. I'm not saying she IS any of those things, of course she isn't.
If the father does not have custody, then wouldn't KB's mother have raised a red flag on November 25th when she realised the child was still with him?
All I mean is, there is a difference between a mother who has custody of her child going away on a trip without her child, and a mother who does not have custody. JMO, no judgement on mothers who don't have custody.