My 18 year old daughter feels sick every time she lacks sleep. she is now working 3rd shift and just got up to puke. what can we do to stop this?

Work on the sleep: People will perform at their best when they have proper amounts of restorative sleep, good health, good nutrition and work in a safe environment. If you know her sleep habits are poor, that is the first area to work on. At 18 she should get no less than 8 hrs of sleep/24 and may need more if her work is physically or mentally challenging. Distractors like electronics/late nights need to stop.