HI, thanks for using healthcare magic
Grief can result in different symptoms such as headache, loss of appetite, insomnia
, muscle aches and pains, nausea.
The nausea that she is experiencing could be related to her loss but there are also other causes of nausea.
The other causes are (1) causes related to the abdomen such as liver disease, GERD, obstruction of the bowel, gall bladder
(2)metabolic effects- alcohol, high calcium, side effects of some medications
(3)central nervous system
causes such as migraine
Though it can be related to her grief , if the nausea continues she may want to see her doctor for an evaluation. If she does not wish to see this doctor then she can consider another.
i hope this helps