Maybe? Like it is hard to say. It depends on how vivid it is and all. For example, your best friend was eaten by a monster in front of you. You can remember it like it really happened and how you felt at that moment the memories are real so think it will be hard to push them next to you.Would you be depressed when somebody tells you that you were fighting in a war in your past life?
In my opinion there are only two real factors here:Depends. All I know is, that in this setting "Telling them" equals "They start to remember". Those battles she fought in must have been at least partially pretty hellish. If I start to remember my comrades in arms dying in my arms or being eaten by a hugh bug in front of me, limbs lying everywhere and shit like that, then: Yupp, I imagine there is a pretty good chance I might get depressed by it.