Are forces of action and reaction real, or a mathematical description?

Amelia has gone metaphysical about perception and the role of Mathamatics as either a tool to calculate things, or somehow the maniffestation of reality itself. She falls on the side of thinking of Maths as a tool. She proposes that Newton's third law is wrong: it does not describe reality, but a boundary condition useful for the calculation of movement, which was caused to exist as a perception of reality because we did not account for the Milky Way to define the force balances which prevent the Earth to plung into the Sun. Problem is, it works so well that it is going to be hard for people to see the difference between describing the actual reality and predicting behaviours, like movement.

There was this cool picture we decided to acknowledge.

Man looking at the Milky Way.
https://www.eso.org/public/images/potw1938a/