This is actually, somewhat confusingly, incorrect. It's true that Fordola's Resonance is the result of copying Krile's Echo. But in patch 4.1, it's revealed that Fordola has been constantly bombarded with visions of the past since she was taken prisoner. Where things get truly bizarre, however, is that it's actually discussed that the reason Fordola is getting these visions is because she's copied Krile's Echo. An excerpt from the quest
Echoes of an Echo:
ALPHINAUD
Taken in combination with the testimonies of Krile and Thancred, I do begin to see exactly what the imperials were attempting here.
The enhancement procedure entailed infusing a single candidate with aether siphoned from a multitude of “supply subjects.”
As for the “master subject”─in this case, Krile─the patterns of her aetheric activity would provide the model upon which they would artificially engineer the candidate's aura.
LYSE
...In other words, they were trying to recreate Krile's Echo?
ALPHINAUD
I believe so─which would explain our prisoner's present state. Krile is possessed of an unrivaled ability to hear the whispers of the soul, and it seems probable that the procedure engendered the same acute sensitivity in Fordola.
LYSE
The soldiers who guard Fordola...many of them lost friends and family to the Skulls.
And there's a sentry at her door, night and day. If she can't help sensing their thoughts and seeing their past─
ARENVALD
But you don't just see their past─you live it. All the emotions; all the pain. Imagine what it'd do to you. You'd never be the same again.
ALPHINAUD
Indeed. As you may recall, Ysayle was completely transformed by a single glimpse of Hraesvelgr's past.
Fordola has been forced to experience the agony of those whose lives she destroyed. The guilt must be unbearable.
The thing is, as you've pointed out... it's the WoL's Echo that does this, not Krile's. And not only is this never addressed, but Fordola having visions is never brought up again after 4.1.