A.V.
Don't make her wait. Tell her that Santa knows where to deliver and do Christmas with her, on time.
When my DD was only 4 months old, the sks were not here. I did not want the precedent set of DD waiting on everyone else and told SD that no, we would not be holding DD's Christmas. Even little kids know when Christmas is (especially if they do any countdowns at school), so just go on with HER morning and then fit others in when they arrive.