There are two kinds of things in the world: physical matter, and spiritual matter. Science deals with the first. Not the second. Psychology is largely a spiritual thing, sorry science.
For life to exist, you need the spirit to be present. It’s the breath of life. “Artificial intelligence”, as it’s called, is great, but it will never have consciousness, because you need the spirit for that.
Wendy Treynor is not afraid to admit to there being spirit, so to me she’s closer than a lot of people in understanding depression and psychology in general. If you can’t admit to the existence of spirit, (which physical science can’t by itself), then how far will you ever get to understanding psychology?