Lily isn't a fool, of course she won't say nothing.
But she's indeed afraid to tell Aidan Lucas, because if Aidan Lucas knew, given his characteristic of loving her more than his child, she can guarantee with her life that Aidan Lucas would never allow her to take such a risk.
But Lily can't do that.
She loves herself, loves Aidan Lucas, but she loves her baby even more.
No matter which child, they're both pieces of flesh from her belly.
She can't treat it rationally, she believes, any mother in her position now would make the same choice as her.
Lily forcefully ordered Cooper I, Cooper II, and others to watch the child at home.
Cooper I and Cooper II tried their best to stop her, but Lily insisted on leaving, and they couldn't do anything.
Moreover, Lily declared that they were not allowed to tell Aidan Lucas.
Aidan Lucas had said before, Lily's words are his words, Cooper I and Cooper II had no choice but to let Lily leave.
