We do know what measurements are. "Superposition" and "collapse" are only really valid concepts in a particular reference frame. A "measurement" is an interacti

We do know what measurements are. "Superposition" and "collapse" are only really valid concepts in a particular reference frame. A "measurement" is an interaction in your preferred reference frame. The cat cannot "collapse" anything from your perpective - only its own. Indeed the cat itself does not experience superposition.