The intended ground flight path is axis +y, and the plane is forward slipping by banking right + left rudder.
In order to keep being on the intended path, forces on x should add up to zero. However, the lift has a component to the right side (+x). I don't understand how the rudder is able to counteract this. The lift can be modeled as a linear force, thus acting on the plane's center of mass; instead, the rudder provides a torque that can change future geometry, but certainly not provide a linear force. What am I missing?