Answer: She is experiencing culture shock .
Explanation:
What is a culture shock?
A culture shock is a shock that is experienced by an individual when they move to an area which is different to the area where they original live.
A person may become disoriented due to the uncommon things that they may find in that new environment or new country.
It may be the way people live , the food they eat , their values , customs and beliefs that may not be familiar to a foreign individual .
In this case Kristina is probably not used to seeing dog's being eaten and it became a shock to her which may be normal to people of Cambodia as they are used to it .