She went into space this last summer. She came back. Numerous scientific papers available on the net will inform you that your T-Cells "shut off" during weightlessness in space.
The T-Cells "turn on" once the astronaut re-enters Earth's field of gravity (that is, once they are no longer in free-fall).
There are a myriad of gene caused auto-immune diseases, all of which are mediated by the T-cells. Some of them such as Celiac Syndrome (gluten intolerance) remain dormant, but they can be triggered by surgery or maybe trips into space. If that happens and the victim decides to eat an extra large pizza, or a piece of breaded chicken, the T-cells could mount a massive attack on the victim's small intestine.
Out of the 30 some symptoms of Celiac, the news has reported that this woman has at least half of them right down to the need for Depends.
She could have also developed an auto-immune attack on her liver if she had any one of 85 different alleles known to exist for one generalized form of porphyria (half of the alleles involve rapid onset of psychosis once the T-cells in the liver are fired up.
Right now this situation is funny. Once you and I get to pay for this woman's lifetime disability retirement as well as her medical care it will become more serious.
Evaluation of an individual's genome can help filter such folks out of the loop of space travel.
An interesting post, and no - I'm not aware of what bodily functions turn on and off due to space trips.
It will be interesting to see what information comes from this as they continue to look into her case.