HI, thanks for using healthcare magic
Drowsiness would occur as a result of the illness itself and also because she is losing fluids from her body.
It is very important that these fluids are replaced , along with electrolytes.
Dehydration is one of the more serious complications of
vomiting and
diarrhea.
Because she is vomiting, she would need to take small amounts at a time.
Hold off the milk and water. Using
pedialyte or a sports drinks which would give her back both fluids and electrolytes would be best.
She should take only 1 tsp to 1 tbs every few minutes.
If this is tolerated after an hour, the amount should be increased. If these small amounts are not tolerated, she may need to have drips/iv fluids.
Using the medication prescribed may also help as well.
I hope this helps