I guess I'm having trouble coming up a concrete representation of stopping her bad brother's plans.
At Cherry Con, Jenny said something during one of the classes she was teaching that helped me grasp this concept better. She said that the concrete goal should be something the viewer of a silent movie can see and understand.
What does your heroine have to actually do to stop her bad brother's plans? Blow up his headquarters? Kill him? Have him arrested? Break into his house and steal the microchip with all the secret passwords on it? Whatever that is, that sounds like it would be your concrete goal.