Hey there:)

To start off I believe that the word "mind" truly doesn't define anything and is rather a vague term (as you already mentioned) to describe the psyche and all of its other components.
The mind is a construct of the brain. The mind refers to the connection of neurons and synapses that make up the brain and enables you to generate that "mind". Therefore, any trauma or stimulus you receive will be translated by the brain and thus affect the brain. Scientists have yet to still understand how the brain is capable of doing so, but from an evolutionary perspective, we know that humans have the highest degree of consciousness that allows them to think about these things. If you had a trauma it demonstrates that you were aware of that situation and because of that perception/understanding, you "allowed" yourself to experience that trauma. If you were not able to interpret that situation properly, your brain would have not been able to translate that information and would have not created a trauma. (Unless the trauma you are talking about is inflicted by a physical force). Our brain can be roughly divided into three areas that serve different functions: the brain stem (automatic functions: breathing or digestion), the cerebellum (coordination and balance), lastly the cerebrum (memory, problem-solving, thinking). Each of these areas has evolved and been "incorporated" into the human brain. The cerebrum being the "latest" region to evolve and exist, is the region that makes us so different from other species. It allows us to generate consciousness or as you call it the mind. So the idea that the brain and mind can be separated from each other is incorrect as the mind is created by the brain and is, therefore, a byproduct of it.
If there was any existing trauma the evidence would be visible in the brain. Although identifying what specific region is causing that would be much more difficult.

Hope this helps!:)