The Time Gate completely surpassed Ketis' imagination.
She simply couldn't process the craziness surrounding the ability to travel back in time and experience history from the perspective of an actual mech pilot.
The fact that she could potentially interfere with the life of the mech pilot in question and change the course of history blew her mind!
The potential abuses were enormous! What if she leaked a lot of future information to the humans in the past? What if she engineered the downfall of the heroes of the present? What if she produced a butterfly effect that ultimately caused her own birth to be unmade?!