Her medical knowledge has not been scrambled, it has been replaced by something out of the Dark Tapestry.
Alternatively, Esta's own memories about the nature and purpose and principles of... all the noisy flashy things in this healer's tent... were eliminated.
Either way, it makes sense of why Esta's holy symbol is missing. Because if he saw anything looking as inscrutable as all those beepy flashy things, attached to an injured Mariona, he would remove them.
Esta will give her a half-smile, exaggerated as he has noticed all of Mariona's facial expressions to now be exaggerated. "Be assured that I am responsibility-acceptingly tracking that."
"You look like you did not get enough sleep before being interrupted. I certainly have more questions but they can wait until you are --" no longer suffering from the Fatigued condition "-- rested."
And it will give him some much-needed time to think, as well.