"There's nothing that can be done about it now." Even if she proposed the idea to the rest of the Hosts, her lack of knowledge would backfire and it would seem futile. If nothing else, Lexa likes to be prepared. Bringing this information forward if they ultimately can't use it would end up exposing her.

Which, admittedly, is part of the issue.

"I'll be leaving now. Try to keep your noise down."