The guest's line was counting fish...
So they narrow it down to she's involved in fish conservation and Arlene asks a question and Miss Kilgallen says "But she said they were alive after she was finished doing whatever she does to them?" And Bennett says "Dorothy that's what conservation means."
And then later on the humiliated Dorothy tries to get back at the guest and says "I have a question for you, let's say you counted wrong? Who'd ever know?" All smug like, then the contestant says "nobody."