They've so obviously been told that they're not allowed to talk about Helen's past because the Helen gossip is much more juicy than anything Danielle has done and none of the newbs have even whispered a word about Helen!
I even suspect that Helen was told in advance that they would be coming in and that they'd been told that they CANNOT mention anything about the Rooney stuff because Helen didn't look at all worried or panicked when they came in.
BB are doing so much to protect Helen that it's beyond a joke!