Quote - Simple.

Outside of Aurora's warp field, time was progressing at the same real time she was experiencing in the alternate universe. Inside the warp bubble, time was slowed. From the outside of the event, Aurora would have been experiencing that 57 seconds over a two day period. The instruments self corrected when things like stellar drift and planetary positioning was measured against recorded time.

 

Which was likely the reason Kara got a laugh out of it. The two day time lapse kind of heavily suggested that her experiences were not the result of hallucinations; but that at least in one universe, her family was alive and well....

 

Sounds like a take off of Voyager episode Season 5, Episode 13 called Gravity.

 

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi