Rory's Birthday Parties - S1-E6
Corrected entry: Just when Rory is cutting the cake at her second birthday party, her grandparents arrive. Sookie is the one to bring in the cake, we don't see her leave the room, and if she did she would meet Richard and Emily on the way. But when Lorelei enters the kitchen a little later, Sookie is there and is surprised to hear that they have come, even she was seemingly in the room when they entered.
Correction: It's perfectly possible Sookie didn't see them because you don't have to go through the hall to go to the kitchen, you can go that way but there's another way too.