Final answer:
A lactose intolerant individual cannot consume dairy products as their body cannot properly digest lactose. They can, however, consume shellfish, gluten, and wine as these do not contain lactose.
Step-by-step explanation:
If a guest has informed you that she is lactose intolerant, she should not order anything containing dairy. Lactose intolerance is a common digestive problem where the body is unable to digest lactose, a type of sugar mainly found in milk and other dairy products. Therefore, she should avoid items such as milk, cheese, butter, and yogurt. Lactose intolerance does not impact the ability to consume shellfish, gluten, or wine as these do not contain lactose.