Anna’s not going to spend a whole lot of time in the basement with the others. Once it becomes apparent there’s not much there she’ll head to the rest of the mansion. Then she’ll do a quick once over to find likely hiding places or maybe she’ll get lucky and it’ll be laying out, after which she’ll search the most likely places until someone stops her, the cleanup is almost done, or there’s two hours remaining until sunrise because she wants enough time to go get her car and get home to sleep.