I have decided...

I have come to the conclusion that Jen has become a vampire. I do not know how it happened, it must have been a direct result of working in the hospital. I believe that she is not a full fledged vampire, having not made her first kill yet.

My evidence is thus:
It seems to me, any time that Jen is out of our bedroom when the sun is out she is ill. She can sleep all day long, getting out of bed at 8:30 and never get ill. But if she gets up at 7:00 when the sun is still up she is sick until about 9:00. At first I thought this might be sleep or food related. But, she can go to sleep at 6:30 pm and get up at 8:00 with Mike, by 8:30 she is ill. I also thought it might be food related. But she was able to eat the KFC with out getting sick.

There can be only on conclusion. She is a vampire.