I am only away from home for a few days before I begin to miss home cooked food and favorites from the local takeaway. Your girlfriend will be exactly the same.
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Thai people do not eat the same as people from the west, they generally do not eat three big meals a day, instead opt for many small meals as and when they are hungry.

Buy a rice cooker

Buy a rice cooker. Rice cookers make it easy to cook and keep rice warm for three – four hours. It will also save you money. (when you learn how to use a rice cooker, you will never boil rice in a pot again)
Rice Cooker

Find stores that stock and sell Thai cooking ingredients

Find stores that stock and sell Thai cooking ingredients. Take your girlfriend their so she can select the ingredients that she needs to cook food she likes.

Make sure your kitchen has all of the food and cooking items your girlfriend will need.

  • Cooking oil
  • Garlic
  • Onions
  • ginger
  • Chili powder
  • Wok
  • Rice cooker

Thai food can smell

Never complain or joke about the smell of Thai food when your girlfriend is cooking, this will make her feel very uncomfortable and self conscious.