Dressing up as The Bride from the Kill Bill movies didn't take that much preparation, just donning the suit and a blonde wig, but Laura had fallen asleep after she got dressed. Hence the getting downstairs after Lotte and Rogue arrived. Whoops.
With her plastic samurai sword in hand, she walked through the mansion to the entry, until she finally spotted her friends by the room with all the food. "I figured I'd find you guys here. Have any trouble finding the place?"