Yes, have her drink one to two quarts a day of CS.  I have seen  several 
cases of food poisoning (at least the symptoms) disappear within 20  minutes 
after 
drinking a quart of CS.  If she can, she should eat some  burned toast (or 
take commercial activated charcoal pills from the health food  store) as these 
absorb the toxins that create nausea.  Toast is also  relatively easy to digest 
with a compromised system, as opposed to milk  products, for instance.  For 
the nausea, take 1/8 teaspoon ginger powder  (from grocery store spice section) 
mixed in a cup of warm water (sip  slowly).  
 
This subject was discussed on this group at length a few months ago, and  the 
consensus was that CS is extremely effective for food poisoning.  
 
Jill