Excellent points! Yes, we have it “backwards” when we take the physical as it appears in our sensory system to be the reality, all there is. Even from the point of view of “classical science” it makes no sense. Our sensory system, in traditional science, was developed for survival. We have eyes that are mostly sensitive in the yellow-green part of the spectrum because it is in that wavelength region that the Sun emits its maximum radiation and also the Earth’s atmosphere (although not the only region) is transparent. If we lived around a red dwarf star (as I am sure there are countess such cases in the universe), human-type of eyes would be useless. We would need eyes that “see” in the red-infrared part of the spectrum!
So why we take a sense-based reality as all there is? And we call it”external”? Very strange.
What might be the case is that we have, as alleged, four bodies. The transcendental body is the “body” of the Self. It is the one that is eternal and survives death. The other three bodies are the physical, the subtle (body of the dream state), and the causal (body of the deep sleep, dreamless, state). In that order they are furthest from the transcendental body, the physical being the furthest, the causal, the closest. The subconscious reality is indeed closest to the Self, if we identify “subconscious” to be the causal state. So your mother is right and she is right to be gently pushing you in that direction from the “other side”. But it is still not the turiya (transcendental) state (and, by the way, there are even more subtle states wherein one becomes or experiences in ascending order more and more universal Awareness, until all there is is undivided Existence with no content of “the other”.
You want to reach the apex of human evolution, the dissolving of the false ego which identifies with the body and the (human) mind. Your mother experienced (as we all do but don’t remember so we deny it) reincarnation. But she is now aware! And you are lucky to have such mother. Continue on this awareness and don’t mind what (ignorant) people may tell you. You are on the right path!