Leah's insistence on saving her friends significantly lowered the chance of a quiet escape.
Since they were throwing in everything, Lola went all out to encourage everyone she could to join the daring escape, albeit remaining extremely conservative on who she told. She didn't inform everyone about the plan, revealing it to only a trusted few at lunch the next day. Those who were part of the plan would be alerted, and they would start preparing themselves without leaking any information.
Leah was set for an important task herself. Her job was to steal any letters related to Normand and Raymond. Since she cleaned Malcolm's study every week, it wasn't too complicated, provided the room was empty.
Leah's biggest worry was that Malcolm would be there while she cleaned. The good news was, Malcolm had something important to do and left the manor early that morning.