That kind of Warden needs to choke on whatever Calling cure they find and tragically die, tbh. 
*ahem*
In any case, it's sad to see where Leliana has ended up emotionally. Varric and Blackwall both say something about her working all the time and doing very little else. According to Cole, she suffers from nightmares too.
We see her display a lot of knee jerk reactions. The traitor agent in Haven, Natalie in Valance, the argument after the destruction of Haven, lashing out against the Maker (again, in Haven), etc. She is in a very delicate place emotionally and is afraid to lose more of what she has lost.
But here comes the irony: If encouraged down the 'hard' path, she reacts on pure emotion to threats of loss: kills Natalie, kidnaps the grand cleric's cousin (who may or may not be a child), kills dissenters if made divine, etc. If something threatens to take something away from her: she destroys it. That's not rational thinking.
However, if she is 'softened', she in fact becomes more stable and rational. She manipulates Natalie into swaying the Grand Cleric, she negotiates with dissenters if made divine and generally thinks more before she acts.
In Origins, hardening or softening her is about accepting or denying her dark side, respectively. In Inquisition, it's about clinging to anything that provides stability or learning to deal with loss and remain flexible.
So for me, hardened in Origins and softened in Inquisition is the way to go.