Had backup plans for her backup plans. Lists about lists. Why the Pack survived.
Leah is the mission controller. PyPy puts it plainly: "Leah planned for everything. She had backup plans for her backup plans." Runkiss puts it with more enthusiasm: "Leah had LISTS! So many lists! Lists about lists!"
When the rescue runs, Leah is the voice in everyone's headset. She is the reason Marcus's improvised spoon-attack worked at all — because she had already mapped two retreat paths and a fallback meeting point before he swung.
She does not romanticise planning. She just knows that, when the network is breaking and the timer is running and Tyler is in pieces, somebody has to be the person who already wrote down what happens next. Leah volunteered for that, and never stopped.