Duplicant is unable (can't) to move, fall or do anything

Duplicant suffocated. Another duplicant resqued her. Than he dropped her onto the ladder.

Nisbet is not dead. She clearly reacts, have errands, stress and everything else.
But she wont die. She stayed in hydrogen for a few cycles by this point. She does not stand on the ladder... or on anything. She does not move. She has only one accecible tile, on witch she "stands". 
I had a happy large colony. There were casualties, but not torcher. Stress stayed low all the time. Now, one of the few original dupes is upset because she cant eat, drink or go to the toilet.
I await your further instructions. Thanks for your help. Hold in there, Nisbet.

I have 24 other duplicants, so I'm not too conserned, but other players can loose a third of their population this way.