Why not just ask her to go over the specifics with you, of what she's basing the diagnosis on? That she called it "profound" doesn't seem to suggest that an offhand assumption was made, without really looking at the criteria. Perhaps you have more of the listed symptoms than are required for a diagnosis; that could cause a practitioner to use the word profound -- but you can't know for sure unless you ask. I don't think you have to question your own relationship with trust here -- it's normal to want to understand.

Though I don't know the exact context, it does make me slightly nervous that she says "anyone would", because people react to trauma differently; not everyone ends up with PTSD, so it's really symptoms that should be looked at for a diagnosis, and not just the existence of past trauma. It's good that you have someone to work through it with though, as it sounds like you could potentially be underestimating its effects on you, which would not be unusual for a trauma survivor. We get so good at sublimating our feelings about these things, pushing them down inside, that they become more difficult to express in a healthy way later on. It's certainly worthy of attention, as are you.