PEOPLE KNEW
Hailee did ask Pyro not to follow her into Aileen's office and told him to wait in the lobby.
Although, at first, Pyro seemed to object to Hailee's decision, because Ramon said not to leave Hailee alone even for a second. But in the end, after much persuasion and promises, the bodyguard agreed, on a note; Hailee had to call him immediately if anything happened. Whatever it might be.
And with Hailee agreeing to the conditions, she went up to the eighteenth floor with none of her bodyguards.
After all, Hailee thought, what could possibly happen to her in an office building full of so many people. Even if Aileen wanted to do something, she wouldn't be stupid enough to do it in front of a crowd, would she?
Therefore, when Aileen said she would escort her to the lobby, she didn't see any bodyguard waiting for Hailee outside her room. This made the former smile inside, thinking that her plan would go well.