A possible scenario:
She leaves the cinnamon rolls on the table, goes to Safeway, they both arrive at her house about the same time. He says, "Let's go get the tree." She gets in the truck with K. Maybe she takes her purchases in and quickly puts stuff away, OR just leaves the bags on the kitchen counter, OR takes them with her ( so where are the things she bought? Was it a box of diapers and baby stuff she took with her?). He takes her to wherever and then the rest happens. IF this is true, she didn't have time to get ready for dinner, but that was her plan for later - come back home, maybe put the tree up, clean up, then out to a Chinese restaurant.
ETA: MOO